102157208838 has 36 divisors (see below), whose sum is σ = 233603272188. Its totient is φ = 32260169160.

The previous prime is 102157208837. The next prime is 102157208893. The reversal of 102157208838 is 838802751201.

It is a junction number, because it is equal to n+sod(n) for n = 102157208793 and 102157208802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102157208831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7854168 + ... + 7867163.

It is an arithmetic number, because the mean of its divisors is an integer number (6488979783).

Almost surely, 2^102157208838 is an apocalyptic number.

102157208838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

102157208838 is an abundant number, since it is smaller than the sum of its proper divisors (131446063350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102157208838 is a wasteful number, since it uses less digits than its factorization.

102157208838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15721377 (or 15721355 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 102157208838 in words is "one hundred two billion, one hundred fifty-seven million, two hundred eight thousand, eight hundred thirty-eight".