31232131220220 has 48 divisors (see below), whose sum is σ = 99942819906048. Its totient is φ = 7138772850240.

The previous prime is 31232131220201. The next prime is 31232131220287. The reversal of 31232131220220 is 2202213123213.

It is a super-2 number, since 2×31232131220220² (a number of 28 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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37181108176 + ... + 37181109015.

It is an arithmetic number, because the mean of its divisors is an integer number (2082142081376).

Almost surely, 2^{31232131220220} is an apocalyptic number.

31232131220220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31232131220220 is an abundant number, since it is smaller than the sum of its proper divisors (68710688685828).

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

31232131220220 is a wasteful number, since it uses less digits than its factorization.

31232131220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74362217210 (or 74362217208 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31232131220220 its reverse (2202213123213), we get a palindrome (33434344343433).

The spelling of 31232131220220 in words is "thirty-one trillion, two hundred thirty-two billion, one hundred thirty-one million, two hundred twenty thousand, two hundred twenty".