31200002013220 has 48 divisors (see below), whose sum is σ = 66129170572080. Its totient is φ = 12363997054464.

The previous prime is 31200002013217. The next prime is 31200002013221. The reversal of 31200002013220 is 2231020000213.

It can be written as a sum of positive squares in 8 ways, for example, as 14724366336 + 31185277646884 = 121344^2 + 5584378^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31200002013194 and 31200002013203.

It is not an unprimeable number, because it can be changed into a prime (31200002013221) 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, 17087902 + ... + 18825418.

It is an arithmetic number, because the mean of its divisors is an integer number (1377691053585).

Almost surely, 2^{31200002013220} is an apocalyptic number.

It is an amenable number.

31200002013220 is an abundant number, since it is smaller than the sum of its proper divisors (34929168558860).

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

31200002013220 is a wasteful number, since it uses less digits than its factorization.

31200002013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745872 (or 1745870 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31200002013220 its reverse (2231020000213), we get a palindrome (33431022013433).

The spelling of 31200002013220 in words is "thirty-one trillion, two hundred billion, two million, thirteen thousand, two hundred twenty".