21676423557 has 16 divisors (see below), whose sum is σ = 29351537600. Its totient is φ = 14226855552.

The previous prime is 21676423553. The next prime is 21676423621. The reversal of 21676423557 is 75532467612.

It is not a de Polignac number, because 21676423557 - 2² = 21676423553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676423553) 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, 29319 + ... + 210267.

It is an arithmetic number, because the mean of its divisors is an integer number (1834471100).

Almost surely, 2^21676423557 is an apocalyptic number.

It is an amenable number.

21676423557 is a deficient number, since it is larger than the sum of its proper divisors (7675114043).

21676423557 is a wasteful number, since it uses less digits than its factorization.

21676423557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181572.

The product of its digits is 2116800, while the sum is 48.

The spelling of 21676423557 in words is "twenty-one billion, six hundred seventy-six million, four hundred twenty-three thousand, five hundred fifty-seven".