31032123220 has 24 divisors (see below), whose sum is σ = 74477096064. Its totient is φ = 10639585056.

The previous prime is 31032123211. The next prime is 31032123233. The reversal of 31032123220 is 2232123013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110828872 + ... + 110829151.

It is an arithmetic number, because the mean of its divisors is an integer number (3103212336).

Almost surely, 2^31032123220 is an apocalyptic number.

It is an amenable number.

31032123220 is an abundant number, since it is smaller than the sum of its proper divisors (43444972844).

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

31032123220 is a wasteful number, since it uses less digits than its factorization.

31032123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221658039 (or 221658037 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31032123220 its reverse (2232123013), we get a palindrome (33264246233).

The spelling of 31032123220 in words is "thirty-one billion, thirty-two million, one hundred twenty-three thousand, two hundred twenty".