1321121272 has 32 divisors (see below), whose sum is σ = 2625663600. Its totient is φ = 621028864.

The previous prime is 1321121267. The next prime is 1321121273. The reversal of 1321121272 is 2721211231.

It is a super-2 number, since 2×1321121272² = 3490722830661795968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321121273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133818 + ... + 143350.

Almost surely, 2^1321121272 is an apocalyptic number.

It is an amenable number.

1321121272 is a deficient number, since it is larger than the sum of its proper divisors (1304542328).

1321121272 is a wasteful number, since it uses less digits than its factorization.

1321121272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10575 (or 10571 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 1321121272 is about 36347.2319716371. The cubic root of 1321121272 is about 1097.2718266217.

The spelling of 1321121272 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred seventy-two".