221102111000021 has 48 divisors (see below), whose sum is σ = 250737865314048. Its totient is φ = 194156760314880.

The previous prime is 221102110999967. The next prime is 221102111000039. The reversal of 221102111000021 is 120000111201122.

It is a de Polignac number, because none of the positive numbers 2^k-221102111000021 is a prime.

It is a super-2 number, since 2×221102111000021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102111000821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49296305 + ... + 53594121.

It is an arithmetic number, because the mean of its divisors is an integer number (5223705527376).

Almost surely, 2^{221102111000021} is an apocalyptic number.

It is an amenable number.

221102111000021 is a deficient number, since it is larger than the sum of its proper divisors (29635754314027).

221102111000021 is a wasteful number, since it uses less digits than its factorization.

221102111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298010 (or 4297979 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221102111000021 its reverse (120000111201122), we get a palindrome (341102222201143).

The spelling of 221102111000021 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred eleven million, twenty-one", and thus it is an aban number.