1321639012 has 48 divisors (see below), whose sum is σ = 2481841600. Its totient is φ = 613992960.

The previous prime is 1321639003. The next prime is 1321639019. The reversal of 1321639012 is 2109361231.

It is a super-2 number, since 2×1321639012² = 3493459356080672288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321639019) 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, 1170064 + ... + 1171192.

Almost surely, 2^1321639012 is an apocalyptic number.

It is an amenable number.

1321639012 is a deficient number, since it is larger than the sum of its proper divisors (1160202588).

1321639012 is a wasteful number, since it uses less digits than its factorization.

1321639012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1321639012 is about 36354.3534119368. The cubic root of 1321639012 is about 1097.4151461215.

The spelling of 1321639012 in words is "one billion, three hundred twenty-one million, six hundred thirty-nine thousand, twelve".