1321221976 has 16 divisors (see below), whose sum is σ = 2480524200. Its totient is φ = 659748864.

The previous prime is 1321221973. The next prime is 1321222013. The reversal of 1321221976 is 6791221231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321221973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101230 + ... + 113533.

Almost surely, 2^1321221976 is an apocalyptic number.

It is an amenable number.

1321221976 is a deficient number, since it is larger than the sum of its proper divisors (1159302224).

1321221976 is a wasteful number, since it uses less digits than its factorization.

1321221976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215538 (or 215534 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 1321221976 is about 36348.6172501789. The cubic root of 1321221976 is about 1097.2997061855.

The spelling of 1321221976 in words is "one billion, three hundred twenty-one million, two hundred twenty-one thousand, nine hundred seventy-six".