21904477057 has 16 divisors (see below), whose sum is σ = 22396898880. Its totient is φ = 21416415552.

The previous prime is 21904477043. The next prime is 21904477081. The reversal of 21904477057 is 75077440912.

It is a cyclic number.

It is not a de Polignac number, because 21904477057 - 2¹¹ = 21904475009 is a prime.

It is a super-2 number, since 2×21904477057² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21904476998 and 21904477016.

It is not an unprimeable number, because it can be changed into a prime (21904477097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12638763 + ... + 12640495.

It is an arithmetic number, because the mean of its divisors is an integer number (1399806180).

Almost surely, 2^21904477057 is an apocalyptic number.

It is an amenable number.

21904477057 is a deficient number, since it is larger than the sum of its proper divisors (492421823).

21904477057 is a wasteful number, since it uses less digits than its factorization.

21904477057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 21904477057 in words is "twenty-one billion, nine hundred four million, four hundred seventy-seven thousand, fifty-seven".