1272332721 has 32 divisors (see below), whose sum is σ = 1918033920. Its totient is φ = 743241600.

The previous prime is 1272332713. The next prime is 1272332759.

1272332721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1272332721 - 2³ = 1272332713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272332021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266685 + ... + 271413.

It is an arithmetic number, because the mean of its divisors is an integer number (59938560).

Almost surely, 2^1272332721 is an apocalyptic number.

1272332721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1272332721 is a deficient number, since it is larger than the sum of its proper divisors (645701199).

1272332721 is a wasteful number, since it uses less digits than its factorization.

1272332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037.

The product of its digits is 7056, while the sum is 30.

The square root of 1272332721 is about 35669.7732120629. The cubic root of 1272332721 is about 1083.5947662754.

The spelling of 1272332721 in words is "one billion, two hundred seventy-two million, three hundred thirty-two thousand, seven hundred twenty-one".