102202111220021 has 4 divisors (see below), whose sum is σ = 102476111518572. Its totient is φ = 101928110921472.

The previous prime is 102202111220003. The next prime is 102202111220071. The reversal of 102202111220021 is 120022111202201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55263032755921 + 46939078464100 = 7433911^2 + 6851210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102202111220021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102202111220071) 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, 137000148716 + ... + 137000149461.

It is an arithmetic number, because the mean of its divisors is an integer number (25619027879643).

Almost surely, 2^{102202111220021} is an apocalyptic number.

It is an amenable number.

102202111220021 is a deficient number, since it is larger than the sum of its proper divisors (274000298551).

102202111220021 is an equidigital number, since it uses as much as digits as its factorization.

102202111220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274000298550.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102202111220021 its reverse (120022111202201), we get a palindrome (222224222422222).

The spelling of 102202111220021 in words is "one hundred two trillion, two hundred two billion, one hundred eleven million, two hundred twenty thousand, twenty-one".