21022111000021 has 8 divisors (see below), whose sum is σ = 21295180726560. Its totient is φ = 20750459818128.

The previous prime is 21022111000013. The next prime is 21022111000063. The reversal of 21022111000021 is 12000011122012.

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 21022111000021 - 2³ = 21022111000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022110999965 and 21022111000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022111000081) 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, 354606331 + ... + 354665608.

It is an arithmetic number, because the mean of its divisors is an integer number (2661897590820).

Almost surely, 2^{21022111000021} is an apocalyptic number.

It is an amenable number.

21022111000021 is a deficient number, since it is larger than the sum of its proper divisors (273069726539).

21022111000021 is a wasteful number, since it uses less digits than its factorization.

21022111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709272323.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21022111000021 its reverse (12000011122012), we get a palindrome (33022122122033).

The spelling of 21022111000021 in words is "twenty-one trillion, twenty-two billion, one hundred eleven million, twenty-one", and thus it is an aban number.