31211201020 has 36 divisors (see below), whose sum is σ = 68517164520. Its totient is φ = 11941672864.

The previous prime is 31211201011. The next prime is 31211201041. The reversal of 31211201020 is 2010211213.

It is a super-2 number, since 2×31211201020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1464430 + ... + 1485589.

It is an arithmetic number, because the mean of its divisors is an integer number (1903254570).

Almost surely, 2^31211201020 is an apocalyptic number.

It is an amenable number.

31211201020 is an abundant number, since it is smaller than the sum of its proper divisors (37305963500).

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

31211201020 is a wasteful number, since it uses less digits than its factorization.

31211201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950074 (or 2950049 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31211201020 its reverse (2010211213), we get a palindrome (33221412233).

The spelling of 31211201020 in words is "thirty-one billion, two hundred eleven million, two hundred one thousand, twenty".