31200213120 has 128 divisors (see below), whose sum is σ = 104685048000. Its totient is φ = 7882149888.

The previous prime is 31200213119. The next prime is 31200213127. The reversal of 31200213120 is 2131200213.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31200213120.

It is not an unprimeable number, because it can be changed into a prime (31200213127) 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, 391155 + ... + 464114.

Almost surely, 2^31200213120 is an apocalyptic number.

31200213120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31200213120 is an abundant number, since it is smaller than the sum of its proper divisors (73484834880).

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

31200213120 is a wasteful number, since it uses less digits than its factorization.

31200213120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855310 (or 855298 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31200213120 its reverse (2131200213), we get a palindrome (33331413333).

The spelling of 31200213120 in words is "thirty-one billion, two hundred million, two hundred thirteen thousand, one hundred twenty".