102221111100021 has 32 divisors (see below), whose sum is σ = 141058031714688. Its totient is φ = 65794287985920.

The previous prime is 102221111099999. The next prime is 102221111100067. The reversal of 102221111100021 is 120001111122201.

It is a happy number.

It is not a de Polignac number, because 102221111100021 - 2¹³ = 102221111091829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221111100421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190116855 + ... + 190653771.

It is an arithmetic number, because the mean of its divisors is an integer number (4408063491084).

Almost surely, 2^{102221111100021} is an apocalyptic number.

It is an amenable number.

102221111100021 is a deficient number, since it is larger than the sum of its proper divisors (38836920614667).

102221111100021 is a wasteful number, since it uses less digits than its factorization.

102221111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550181.

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

Adding to 102221111100021 its reverse (120001111122201), we get a palindrome (222222222222222).

The spelling of 102221111100021 in words is "one hundred two trillion, two hundred twenty-one billion, one hundred eleven million, one hundred thousand, twenty-one".