102115504251 has 16 divisors (see below), whose sum is σ = 151820610720. Its totient is φ = 67834730880.

The previous prime is 102115504243. The next prime is 102115504279. The reversal of 102115504251 is 152405511201.

It is a happy number.

102115504251 is a `hidden beast` number, since 1 + 0 + 21 + 1 + 550 + 42 + 51 = 666.

It is not a de Polignac number, because 102115504251 - 2³ = 102115504243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (102115503251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6722050 + ... + 6737223.

It is an arithmetic number, because the mean of its divisors is an integer number (9488788170).

Almost surely, 2^102115504251 is an apocalyptic number.

102115504251 is a deficient number, since it is larger than the sum of its proper divisors (49705106469).

102115504251 is a wasteful number, since it uses less digits than its factorization.

102115504251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13459563 (or 13459557 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 102115504251 in words is "one hundred two billion, one hundred fifteen million, five hundred four thousand, two hundred fifty-one".