1321522272 has 72 divisors (see below), whose sum is σ = 4294953936. Its totient is φ = 377577216.

The previous prime is 1321522211. The next prime is 1321522283. The reversal of 1321522272 is 2722251231.

1321522272 is a `hidden beast` number, since 132 + 1 + 522 + 2 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1321522272² = 3492842230784083968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325743 + ... + 329774.

It is an arithmetic number, because the mean of its divisors is an integer number (59652138).

Almost surely, 2^1321522272 is an apocalyptic number.

1321522272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321522272 is an abundant number, since it is smaller than the sum of its proper divisors (2973431664).

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

1321522272 is a wasteful number, since it uses less digits than its factorization.

1321522272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655540 (or 655529 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 1321522272 is about 36352.7477916044. The cubic root of 1321522272 is about 1097.3828337136.

The spelling of 1321522272 in words is "one billion, three hundred twenty-one million, five hundred twenty-two thousand, two hundred seventy-two".