21675874557 has 16 divisors (see below), whose sum is σ = 30431760320. Its totient is φ = 13685760000.

The previous prime is 21675874543. The next prime is 21675874589. The reversal of 21675874557 is 75547857612.

It is not a de Polignac number, because 21675874557 - 2²⁶ = 21608765693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21675874497 and 21675874506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675874657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130557 + ... + 245757.

It is an arithmetic number, because the mean of its divisors is an integer number (1901985020).

Almost surely, 2^21675874557 is an apocalyptic number.

It is an amenable number.

21675874557 is a deficient number, since it is larger than the sum of its proper divisors (8755885763).

21675874557 is a wasteful number, since it uses less digits than its factorization.

21675874557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118524.

The product of its digits is 16464000, while the sum is 57.

The spelling of 21675874557 in words is "twenty-one billion, six hundred seventy-five million, eight hundred seventy-four thousand, five hundred fifty-seven".