31213030220 has 96 divisors (see below), whose sum is σ = 68660355456. Its totient is φ = 11908454400.

The previous prime is 31213030181. The next prime is 31213030231. The reversal of 31213030220 is 2203031213.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8651657 + ... + 8655263.

It is an arithmetic number, because the mean of its divisors is an integer number (715212036).

Almost surely, 2^31213030220 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 31213030220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34330177728).

31213030220 is an abundant number, since it is smaller than the sum of its proper divisors (37447325236).

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

31213030220 is a wasteful number, since it uses less digits than its factorization.

31213030220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891 (or 3889 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31213030220 its reverse (2203031213), we get a palindrome (33416061433).

The spelling of 31213030220 in words is "thirty-one billion, two hundred thirteen million, thirty thousand, two hundred twenty".