31220011000 has 32 divisors (see below), whose sum is σ = 73054828080. Its totient is φ = 12488004000.

The previous prime is 31220010977. The next prime is 31220011007. The reversal of 31220011000 is 11002213.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220011007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15609006 + ... + 15611005.

Almost surely, 2^31220011000 is an apocalyptic number.

It is an amenable number.

31220011000 is an abundant number, since it is smaller than the sum of its proper divisors (41834817080).

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

31220011000 is a wasteful number, since it uses less digits than its factorization.

31220011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31220032 (or 31220018 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31220011000 its reverse (11002213), we get a palindrome (31231013213).

The spelling of 31220011000 in words is "thirty-one billion, two hundred twenty million, eleven thousand".