21154624377 has 32 divisors (see below), whose sum is σ = 30374707200. Its totient is φ = 13053996288.

The previous prime is 21154624357. The next prime is 21154624391. The reversal of 21154624377 is 77342645112.

It is not a de Polignac number, because 21154624377 - 2¹⁴ = 21154607993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21154624357) 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, 1619649 + ... + 1632657.

It is an arithmetic number, because the mean of its divisors is an integer number (949209600).

Almost surely, 2^21154624377 is an apocalyptic number.

It is an amenable number.

21154624377 is a deficient number, since it is larger than the sum of its proper divisors (9220082823).

21154624377 is a wasteful number, since it uses less digits than its factorization.

21154624377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13685.

The product of its digits is 282240, while the sum is 42.

The spelling of 21154624377 in words is "twenty-one billion, one hundred fifty-four million, six hundred twenty-four thousand, three hundred seventy-seven".