21257919040623 has 32 divisors (see below), whose sum is σ = 30273383750400. Its totient is φ = 13222061016576.

The previous prime is 21257919040609. The next prime is 21257919040643. The reversal of 21257919040623 is 32604091975212.

It is not a de Polignac number, because 21257919040623 - 2⁴ = 21257919040607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21257919040643) 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, 2333008 + ... + 6925226.

It is an arithmetic number, because the mean of its divisors is an integer number (946043242200).

Almost surely, 2^{21257919040623} is an apocalyptic number.

21257919040623 is a deficient number, since it is larger than the sum of its proper divisors (9015464709777).

21257919040623 is a wasteful number, since it uses less digits than its factorization.

21257919040623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593031.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 21257919040623 in words is "twenty-one trillion, two hundred fifty-seven billion, nine hundred nineteen million, forty thousand, six hundred twenty-three".