21424560155 has 16 divisors (see below), whose sum is σ = 26602979040. Its totient is φ = 16552935168.

The previous prime is 21424560139. The next prime is 21424560161. The reversal of 21424560155 is 55106542412.

It is a cyclic number.

It is not a de Polignac number, because 21424560155 - 2⁴ = 21424560139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540692 + ... + 578961.

It is an arithmetic number, because the mean of its divisors is an integer number (1662686190).

Almost surely, 2^21424560155 is an apocalyptic number.

21424560155 is a deficient number, since it is larger than the sum of its proper divisors (5178418885).

21424560155 is a wasteful number, since it uses less digits than its factorization.

21424560155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119790.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 21424560155 in words is "twenty-one billion, four hundred twenty-four million, five hundred sixty thousand, one hundred fifty-five".