31201020099 has 20 divisors (see below), whose sum is σ = 46673843040. Its totient is φ = 20771711280.

The previous prime is 31201020079. The next prime is 31201020143. The reversal of 31201020099 is 99002010213.

It is not a de Polignac number, because 31201020099 - 2³³ = 22611085507 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 (31201020029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 209632 + ... + 326109.

It is an arithmetic number, because the mean of its divisors is an integer number (2333692152).

Almost surely, 2^31201020099 is an apocalyptic number.

31201020099 is a deficient number, since it is larger than the sum of its proper divisors (15472822941).

31201020099 is an equidigital number, since it uses as much as digits as its factorization.

31201020099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536472 (or 536463 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 31201020099 in words is "thirty-one billion, two hundred one million, twenty thousand, ninety-nine".