21858517124445 has 32 divisors (see below), whose sum is σ = 36119070236160. Its totient is φ = 11281635453440.

The previous prime is 21858517124429. The next prime is 21858517124513. The reversal of 21858517124445 is 54442171585812.

It is not a de Polignac number, because 21858517124445 - 2⁴ = 21858517124429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174122586 + ... + 174248075.

It is an arithmetic number, because the mean of its divisors is an integer number (1128720944880).

Almost surely, 2^{21858517124445} is an apocalyptic number.

It is an amenable number.

21858517124445 is a deficient number, since it is larger than the sum of its proper divisors (14260553111715).

21858517124445 is a wasteful number, since it uses less digits than its factorization.

21858517124445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348370805.

The product of its digits is 14336000, while the sum is 57.

The spelling of 21858517124445 in words is "twenty-one trillion, eight hundred fifty-eight billion, five hundred seventeen million, one hundred twenty-four thousand, four hundred forty-five".