31312213300 has 72 divisors (see below), whose sum is σ = 71982642816. Its totient is φ = 11781864960.

The previous prime is 31312213277. The next prime is 31312213321. The reversal of 31312213300 is 331221313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4319479 + ... + 4326721.

It is an arithmetic number, because the mean of its divisors is an integer number (999758928).

Almost surely, 2^31312213300 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31312213300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35991321408).

31312213300 is an abundant number, since it is smaller than the sum of its proper divisors (40670429516).

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

31312213300 is a wasteful number, since it uses less digits than its factorization.

31312213300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9817 (or 9810 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31312213300 its reverse (331221313), we get a palindrome (31643434613).

The spelling of 31312213300 in words is "thirty-one billion, three hundred twelve million, two hundred thirteen thousand, three hundred".