31223252051020 has 12 divisors (see below), whose sum is σ = 65568829307184. Its totient is φ = 12489300820400.

The previous prime is 31223252051009. The next prime is 31223252051029. The reversal of 31223252051020 is 2015025232213.

It is a self number, because there is not a number n which added to its sum of digits gives 31223252051020.

It is not an unprimeable number, because it can be changed into a prime (31223252051029) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 780581301256 + ... + 780581301295.

It is an arithmetic number, because the mean of its divisors is an integer number (5464069108932).

Almost surely, 2^{31223252051020} is an apocalyptic number.

It is an amenable number.

31223252051020 is an abundant number, since it is smaller than the sum of its proper divisors (34345577256164).

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

31223252051020 is a wasteful number, since it uses less digits than its factorization.

31223252051020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561162602560 (or 1561162602558 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 31223252051020 its reverse (2015025232213), we get a palindrome (33238277283233).

The spelling of 31223252051020 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred fifty-two million, fifty-one thousand, twenty".