21024074955 has 32 divisors (see below), whose sum is σ = 36271819584. Its totient is φ = 10337250816.

The previous prime is 21024074941. The next prime is 21024074957. The reversal of 21024074955 is 55947042012.

It is not a de Polignac number, because 21024074955 - 2¹⁸ = 21023812811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21024074957) 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, 87777 + ... + 223053.

It is an arithmetic number, because the mean of its divisors is an integer number (1133494362).

Almost surely, 2^21024074955 is an apocalyptic number.

21024074955 is a deficient number, since it is larger than the sum of its proper divisors (15247744629).

21024074955 is a wasteful number, since it uses less digits than its factorization.

21024074955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136095.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 21024074955 in words is "twenty-one billion, twenty-four million, seventy-four thousand, nine hundred fifty-five".