2211021212021 has 4 divisors (see below), whose sum is σ = 2211041222700. Its totient is φ = 2211001201344.

The previous prime is 2211021212009. The next prime is 2211021212039. The reversal of 2211021212021 is 1202121201122.

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 1323157881796 + 887863330225 = 1150286^2 + 942265^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211021212021 - 2¹⁸ = 2211020949877 is a prime.

It is a super-2 number, since 2×2211021212021² (a number of 25 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 (2211021212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9838676 + ... + 10060893.

It is an arithmetic number, because the mean of its divisors is an integer number (552760305675).

Almost surely, 2^{2211021212021} is an apocalyptic number.

It is an amenable number.

2211021212021 is a deficient number, since it is larger than the sum of its proper divisors (20010679).

2211021212021 is a wasteful number, since it uses less digits than its factorization.

2211021212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010678.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2211021212021 its reverse (1202121201122), we get a palindrome (3413142413143).

The spelling of 2211021212021 in words is "two trillion, two hundred eleven billion, twenty-one million, two hundred twelve thousand, twenty-one".