31220031011 has 16 divisors (see below), whose sum is σ = 34640796960. Its totient is φ = 27952999680.

The previous prime is 31220030993. The next prime is 31220031041. The reversal of 31220031011 is 11013002213.

It is a de Polignac number, because none of the positive numbers 2^k-31220031011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220031041) 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, 77081 + ... + 261498.

It is an arithmetic number, because the mean of its divisors is an integer number (2165049810).

Almost surely, 2^31220031011 is an apocalyptic number.

31220031011 is a deficient number, since it is larger than the sum of its proper divisors (3420765949).

31220031011 is a wasteful number, since it uses less digits than its factorization.

31220031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338806.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31220031011 its reverse (11013002213), we get a palindrome (42233033224).

The spelling of 31220031011 in words is "thirty-one billion, two hundred twenty million, thirty-one thousand, eleven".