21122122313021 has 16 divisors (see below), whose sum is σ = 21819119513088. Its totient is φ = 20426106225600.

The previous prime is 21122122312999. The next prime is 21122122313101. The reversal of 21122122313021 is 12031322122112.

It is a cyclic number.

It is not a de Polignac number, because 21122122313021 - 2⁶ = 21122122312957 is a prime.

It is a super-2 number, since 2×21122122313021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122122319021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399552131 + ... + 399604991.

It is an arithmetic number, because the mean of its divisors is an integer number (1363694969568).

Almost surely, 2^{21122122313021} is an apocalyptic number.

It is an amenable number.

21122122313021 is a deficient number, since it is larger than the sum of its proper divisors (696997200067).

21122122313021 is a wasteful number, since it uses less digits than its factorization.

21122122313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61892.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21122122313021 its reverse (12031322122112), we get a palindrome (33153444435133).

The spelling of 21122122313021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, three hundred thirteen thousand, twenty-one".