31221421000 has 128 divisors (see below), whose sum is σ = 91085679360. Its totient is φ = 9731328000.

The previous prime is 31221420983. The next prime is 31221421013. The reversal of 31221421000 is 12412213.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125737 + ... + 279736.

It is an arithmetic number, because the mean of its divisors is an integer number (711606870).

Almost surely, 2^31221421000 is an apocalyptic number.

It is an amenable number.

31221421000 is an abundant number, since it is smaller than the sum of its proper divisors (59864258360).

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

31221421000 is a wasteful number, since it uses less digits than its factorization.

31221421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405512 (or 405498 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31221421000 its reverse (12412213), we get a palindrome (31233833213).

The spelling of 31221421000 in words is "thirty-one billion, two hundred twenty-one million, four hundred twenty-one thousand".