31232223121220 has 48 divisors (see below), whose sum is σ = 72005917612608. Its totient is φ = 11284833356160.

The previous prime is 31232223121199. The next prime is 31232223121241. The reversal of 31232223121220 is 2212132223213.

It is an interprime number because it is at equal distance from previous prime (31232223121199) and next prime (31232223121241).

It is a super-2 number, since 2×31232223121220² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31232223121220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452082182 + ... + 452151261.

It is an arithmetic number, because the mean of its divisors is an integer number (1500123283596).

Almost surely, 2^{31232223121220} is an apocalyptic number.

It is an amenable number.

31232223121220 is an abundant number, since it is smaller than the sum of its proper divisors (40773694491388).

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

31232223121220 is a wasteful number, since it uses less digits than its factorization.

31232223121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904233620 (or 904233618 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 31232223121220 its reverse (2212132223213), we get a palindrome (33444355344433).

The spelling of 31232223121220 in words is "thirty-one trillion, two hundred thirty-two billion, two hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty".