102131210 has 16 divisors (see below), whose sum is σ = 183961800. Its totient is φ = 40824576.

The previous prime is 102131209. The next prime is 102131219. The reversal of 102131210 is 12131201.

It can be written as a sum of positive squares in 4 ways, for example, as 100020001 + 2111209 = 10001^2 + 1453^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102131191 and 102131200.

It is not an unprimeable number, because it can be changed into a prime (102131219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18446 + ... + 23334.

Almost surely, 2^102131210 is an apocalyptic number.

102131210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102131210 is a deficient number, since it is larger than the sum of its proper divisors (81830590).

102131210 is a wasteful number, since it uses less digits than its factorization.

102131210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6985.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 102131210 is about 10105.9987136354. The cubic root of 102131210 is about 467.4331321712.

Adding to 102131210 its reverse (12131201), we get a palindrome (114262411).

Subtracting from 102131210 its reverse (12131201), we obtain a palindrome (90000009).

The spelling of 102131210 in words is "one hundred two million, one hundred thirty-one thousand, two hundred ten".