31221304140020 has 12 divisors (see below), whose sum is σ = 65564738694084. Its totient is φ = 12488521656000.

The previous prime is 31221304139957. The next prime is 31221304140031. The reversal of 31221304140020 is 2004140312213.

It can be written as a sum of positive squares in 2 ways, for example, as 22962382280464 + 8258921859556 = 4791908^2 + 2873834^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780532603481 + ... + 780532603520.

It is an arithmetic number, because the mean of its divisors is an integer number (5463728224507).

Almost surely, 2^{31221304140020} is an apocalyptic number.

It is an amenable number.

31221304140020 is an abundant number, since it is smaller than the sum of its proper divisors (34343434554064).

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

31221304140020 is a wasteful number, since it uses less digits than its factorization.

31221304140020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561065207010 (or 1561065207008 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31221304140020 its reverse (2004140312213), we get a palindrome (33225444452233).

The spelling of 31221304140020 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred four million, one hundred forty thousand, twenty".