1320221992 has 64 divisors (see below), whose sum is σ = 2654467200. Its totient is φ = 613785600.

The previous prime is 1320221983. The next prime is 1320221999. The reversal of 1320221992 is 2991220231.

It is a super-2 number, since 2×1320221992² = 3485972216320896128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320221999) 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, 2226048 + ... + 2226640.

It is an arithmetic number, because the mean of its divisors is an integer number (41476050).

Almost surely, 2^1320221992 is an apocalyptic number.

It is an amenable number.

1320221992 is an abundant number, since it is smaller than the sum of its proper divisors (1334245208).

1320221992 is a wasteful number, since it uses less digits than its factorization.

1320221992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1320221992 is about 36334.8591850856. The cubic root of 1320221992 is about 1097.0228011394.

The spelling of 1320221992 in words is "one billion, three hundred twenty million, two hundred twenty-one thousand, nine hundred ninety-two".