1137321621 has 8 divisors (see below), whose sum is σ = 1684920960. Its totient is φ = 758214396.

The previous prime is 1137321617. The next prime is 1137321629. The reversal of 1137321621 is 1261237311.

1137321621 is a `hidden beast` number, since 1 + 1 + 3 + 7 + 32 + 1 + 621 = 666.

It is not a de Polignac number, because 1137321621 - 2² = 1137321617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 42123023 = 1137321621 / (1 + 1 + 3 + 7 + 3 + 2 + 1 + 6 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1137321629) 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, 21061485 + ... + 21061538.

It is an arithmetic number, because the mean of its divisors is an integer number (210615120).

Almost surely, 2^1137321621 is an apocalyptic number.

It is an amenable number.

1137321621 is a deficient number, since it is larger than the sum of its proper divisors (547599339).

1137321621 is an equidigital number, since it uses as much as digits as its factorization.

1137321621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42123032 (or 42123026 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1137321621 is about 33724.1993381607. The cubic root of 1137321621 is about 1043.8251705527.

Adding to 1137321621 its reverse (1261237311), we get a palindrome (2398558932).

The spelling of 1137321621 in words is "one billion, one hundred thirty-seven million, three hundred twenty-one thousand, six hundred twenty-one".