31213200000 has 576 divisors, whose sum is σ = 112113136800. Its totient is φ = 7672320000.

The previous prime is 31213199993. The next prime is 31213200023. The reversal of 31213200000 is 231213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 843599982 + ... + 843600018.

Almost surely, 2^31213200000 is an apocalyptic number.

31213200000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56056568400).

31213200000 is an abundant number, since it is smaller than the sum of its proper divisors (80899936800).

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

31213200000 is an frugal number, since it uses more digits than its factorization.

31213200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31213200000 its reverse (231213), we get a palindrome (31213431213).

The spelling of 31213200000 in words is "thirty-one billion, two hundred thirteen million, two hundred thousand".