31033221320 has 64 divisors (see below), whose sum is σ = 73044342000. Its totient is φ = 11850539008.

The previous prime is 31033221277. The next prime is 31033221347. The reversal of 31033221320 is 2312233013.

It can be written as a sum of positive squares in 8 ways, for example, as 19716091396 + 11317129924 = 140414^2 + 106382^2 .

It is a super-2 number, since 2×31033221320² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31033221292 and 31033221301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47057 + ... + 253536.

Almost surely, 2^31033221320 is an apocalyptic number.

It is an amenable number.

31033221320 is an abundant number, since it is smaller than the sum of its proper divisors (42011120680).

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

31033221320 is a wasteful number, since it uses less digits than its factorization.

31033221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300722 (or 300718 counting only the distinct ones).

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

Adding to 31033221320 its reverse (2312233013), we get a palindrome (33345454333).

The spelling of 31033221320 in words is "thirty-one billion, thirty-three million, two hundred twenty-one thousand, three hundred twenty".