21122110011021 has 4 divisors (see below), whose sum is σ = 28162813348032. Its totient is φ = 14081406674012.

The previous prime is 21122110010767. The next prime is 21122110011083. The reversal of 21122110011021 is 12011001122112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21122110011021 - 2¹⁰ = 21122110009997 is a prime.

It is a super-2 number, since 2×21122110011021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122110001021) 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, 3520351668501 + ... + 3520351668506.

It is an arithmetic number, because the mean of its divisors is an integer number (7040703337008).

Almost surely, 2^{21122110011021} is an apocalyptic number.

It is an amenable number.

21122110011021 is a deficient number, since it is larger than the sum of its proper divisors (7040703337011).

21122110011021 is an equidigital number, since it uses as much as digits as its factorization.

21122110011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040703337010.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21122110011021 its reverse (12011001122112), we get a palindrome (33133111133133).

The spelling of 21122110011021 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred ten million, eleven thousand, twenty-one".