102031313121 has 28 divisors (see below), whose sum is σ = 154491724500. Its totient is φ = 67347352800.

The previous prime is 102031313117. The next prime is 102031313129. The reversal of 102031313121 is 121313130201.

It can be written as a sum of positive squares in 2 ways, for example, as 45577553121 + 56453760000 = 213489^2 + 237600^2 .

It is not a de Polignac number, because 102031313121 - 2² = 102031313117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102031313094 and 102031313103.

It is not an unprimeable number, because it can be changed into a prime (102031313129) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 619246 + ... + 766503.

Almost surely, 2^102031313121 is an apocalyptic number.

It is an amenable number.

102031313121 is a deficient number, since it is larger than the sum of its proper divisors (52460411379).

102031313121 is an equidigital number, since it uses as much as digits as its factorization.

102031313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385868 (or 1385853 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 102031313121 its reverse (121313130201), we get a palindrome (223344443322).

The spelling of 102031313121 in words is "one hundred two billion, thirty-one million, three hundred thirteen thousand, one hundred twenty-one".