31321221013000 has 64 divisors (see below), whose sum is σ = 73783547838000. Its totient is φ = 12444404531200.

The previous prime is 31321221012953. The next prime is 31321221013003. The reversal of 31321221013000 is 31012212313.

It can be written as a sum of positive squares in 8 ways, for example, as 3156144114916 + 28165076898084 = 1776554^2 + 5307078^2 .

It is not an unprimeable number, because it can be changed into a prime (31321221013003) 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, 104955769 + ... + 105253768.

Almost surely, 2^{31321221013000} is an apocalyptic number.

It is an amenable number.

31321221013000 is an abundant number, since it is smaller than the sum of its proper divisors (42462326825000).

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

31321221013000 is a wasteful number, since it uses less digits than its factorization.

31321221013000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210209707 (or 210209693 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31321221013000 its reverse (31012212313), we get a palindrome (31352233225313).

The spelling of 31321221013000 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty-one million, thirteen thousand".