1272611921 has 8 divisors (see below), whose sum is σ = 1454632704. Its totient is φ = 1090645920.

The previous prime is 1272611911. The next prime is 1272611941. The reversal of 1272611921 is 1291162721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1272611921 is a prime.

It is a super-2 number, since 2×1272611921² = 3239082202942620482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1272611911) 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, 71141 + ... + 87213.

It is an arithmetic number, because the mean of its divisors is an integer number (181829088).

Almost surely, 2^1272611921 is an apocalyptic number.

It is an amenable number.

1272611921 is a deficient number, since it is larger than the sum of its proper divisors (182020783).

1272611921 is a wasteful number, since it uses less digits than its factorization.

1272611921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27391.

The product of its digits is 3024, while the sum is 32.

The square root of 1272611921 is about 35673.6866751952. The cubic root of 1272611921 is about 1083.6740216270.

The spelling of 1272611921 in words is "one billion, two hundred seventy-two million, six hundred eleven thousand, nine hundred twenty-one".