102111550621 has 4 divisors (see below), whose sum is σ = 102701790972. Its totient is φ = 101521310272.

The previous prime is 102111550561. The next prime is 102111550627. The reversal of 102111550621 is 126055111201.

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 85421752900 + 16689797721 = 292270^2 + 129189^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111550621 - 2³⁵ = 67751812253 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 (102111550627) 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, 295119916 + ... + 295120261.

It is an arithmetic number, because the mean of its divisors is an integer number (25675447743).

Almost surely, 2^102111550621 is an apocalyptic number.

It is an amenable number.

102111550621 is a deficient number, since it is larger than the sum of its proper divisors (590240351).

102111550621 is an equidigital number, since it uses as much as digits as its factorization.

102111550621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590240350.

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 102111550621 its reverse (126055111201), we get a palindrome (228166661822).

The spelling of 102111550621 in words is "one hundred two billion, one hundred eleven million, five hundred fifty thousand, six hundred twenty-one".