31221023330 has 32 divisors (see below), whose sum is σ = 65719741824. Its totient is φ = 10455411456.

The previous prime is 31221023321. The next prime is 31221023359. The reversal of 31221023330 is 3332012213.

It is a super-4 number, since 4×31221023330⁴ (a number of 43 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5183207 + ... + 5189226.

It is an arithmetic number, because the mean of its divisors is an integer number (2053741932).

Almost surely, 2^31221023330 is an apocalyptic number.

31221023330 is an abundant number, since it is smaller than the sum of its proper divisors (34498718494).

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

31221023330 is a wasteful number, since it uses less digits than its factorization.

31221023330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372490.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31221023330 its reverse (3332012213), we get a palindrome (34553035543).

The spelling of 31221023330 in words is "thirty-one billion, two hundred twenty-one million, twenty-three thousand, three hundred thirty".