21224523155 has 16 divisors (see below), whose sum is σ = 27790850304. Its totient is φ = 15432672480.

The previous prime is 21224523143. The next prime is 21224523223. The reversal of 21224523155 is 55132542212.

It is not a de Polignac number, because 21224523155 - 2⁶ = 21224523091 is a prime.

It is a Duffinian number.

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, 230312 + ... + 309018.

It is an arithmetic number, because the mean of its divisors is an integer number (1736928144).

Almost surely, 2^21224523155 is an apocalyptic number.

21224523155 is a deficient number, since it is larger than the sum of its proper divisors (6566327149).

21224523155 is a wasteful number, since it uses less digits than its factorization.

21224523155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83626.

The product of its digits is 24000, while the sum is 32.

The spelling of 21224523155 in words is "twenty-one billion, two hundred twenty-four million, five hundred twenty-three thousand, one hundred fifty-five".