11212101221021 has 4 divisors (see below), whose sum is σ = 11258624462844. Its totient is φ = 11165577979200.

The previous prime is 11212101220951. The next prime is 11212101221029. The reversal of 11212101221021 is 12012210121211.

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 8274476618521 + 2937624602500 = 2876539^2 + 1713950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212101221021 is a prime.

It is a super-2 number, since 2×11212101221021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212101221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23261620550 + ... + 23261621031.

It is an arithmetic number, because the mean of its divisors is an integer number (2814656115711).

Almost surely, 2^{11212101221021} is an apocalyptic number.

It is an amenable number.

11212101221021 is a deficient number, since it is larger than the sum of its proper divisors (46523241823).

11212101221021 is an equidigital number, since it uses as much as digits as its factorization.

11212101221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46523241822.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11212101221021 its reverse (12012210121211), we get a palindrome (23224311342232).

The spelling of 11212101221021 in words is "eleven trillion, two hundred twelve billion, one hundred one million, two hundred twenty-one thousand, twenty-one".