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BaseRepresentation
bin100000001100001100110…
…000100011001011001101
321211110212121012122211001
4200030030300203023031
5242220411241223041
64412122424100301
7315551310356122
oct40141460431315
97743777178731
102212122211021
117831793555a8
122b8883304691
131307aa137478
14790d28c2749
153c8207b3131
hex2030cc232cd

2212122211021 has 4 divisors (see below), whose sum is σ = 2212125560572. Its totient is φ = 2212118861472.

The previous prime is 2212122210979. The next prime is 2212122211027. The reversal of 2212122211021 is 1201122212122.

Adding to 2212122211021 its reverse (1201122212122), we get a palindrome (3413244423143).

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 708187888521 + 1503934322500 = 841539^2 + 1226350^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212122211021 - 229 = 2211585340109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212122211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212122211027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317466 + ... + 2127211.

It is an arithmetic number, because the mean of its divisors is an integer number (553031390143).

Almost surely, 22212122211021 is an apocalyptic number.

It is an amenable number.

2212122211021 is a deficient number, since it is larger than the sum of its proper divisors (3349551).

2212122211021 is an equidigital number, since it uses as much as digits as its factorization.

2212122211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349550.

The product of its (nonzero) digits is 128, while the sum is 19.

The spelling of 2212122211021 in words is "two trillion, two hundred twelve billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".

Divisors: 1 904873 2444677 2212122211021