21122110111021 has 8 divisors (see below), whose sum is σ = 21613852255424. Its totient is φ = 20630392070400.

The previous prime is 21122110111019. The next prime is 21122110111073. The reversal of 21122110111021 is 12011101122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122110111021 - 2¹ = 21122110111019 is a prime.

It is a super-2 number, since 2×21122110111021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122110110986 and 21122110111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122110115021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4246905 + ... + 7764046.

It is an arithmetic number, because the mean of its divisors is an integer number (2701731531928).

Almost surely, 2^{21122110111021} is an apocalyptic number.

It is an amenable number.

21122110111021 is a deficient number, since it is larger than the sum of its proper divisors (491742144403).

21122110111021 is a wasteful number, since it uses less digits than its factorization.

21122110111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12051891.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21122110111021 its reverse (12011101122112), we get a palindrome (33133211233133).

The spelling of 21122110111021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred ten million, one hundred eleven thousand, twenty-one".