31223504041220 has 48 divisors (see below), whose sum is σ = 65591491004928. Its totient is φ = 12485186663040.

The previous prime is 31223504041201. The next prime is 31223504041229. The reversal of 31223504041220 is 2214040532213.

It is a super-2 number, since 2×31223504041220² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31223504041229) 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, 935070725 + ... + 935104115.

It is an arithmetic number, because the mean of its divisors is an integer number (1366489395936).

Almost surely, 2^{31223504041220} is an apocalyptic number.

It is an amenable number.

31223504041220 is an abundant number, since it is smaller than the sum of its proper divisors (34367986963708).

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

31223504041220 is a wasteful number, since it uses less digits than its factorization.

31223504041220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47780 (or 47778 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 31223504041220 its reverse (2214040532213), we get a palindrome (33437544573433).

The spelling of 31223504041220 in words is "thirty-one trillion, two hundred twenty-three billion, five hundred four million, forty-one thousand, two hundred twenty".