31242401220520 has 64 divisors (see below), whose sum is σ = 80338086662400. Its totient is φ = 10711615948800.

The previous prime is 31242401220487. The next prime is 31242401220521. The reversal of 31242401220520 is 2502210424213.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (31242401220521) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 84263301 + ... + 84633259.

It is an arithmetic number, because the mean of its divisors is an integer number (1255282604100).

Almost surely, 2^{31242401220520} is an apocalyptic number.

It is an amenable number.

31242401220520 is an abundant number, since it is smaller than the sum of its proper divisors (49095685441880).

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

31242401220520 is a wasteful number, since it uses less digits than its factorization.

31242401220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671578 (or 671574 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 31242401220520 its reverse (2502210424213), we get a palindrome (33744611644733).

The spelling of 31242401220520 in words is "thirty-one trillion, two hundred forty-two billion, four hundred one million, two hundred twenty thousand, five hundred twenty".