21105657476 has 12 divisors (see below), whose sum is σ = 36942151680. Its totient is φ = 10550757000.

The previous prime is 21105657457. The next prime is 21105657487. The reversal of 21105657476 is 67475650112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494900 + ... + 535851.

It is an arithmetic number, because the mean of its divisors is an integer number (3078512640).

Almost surely, 2^21105657476 is an apocalyptic number.

It is an amenable number.

21105657476 is a deficient number, since it is larger than the sum of its proper divisors (15836494204).

21105657476 is a wasteful number, since it uses less digits than its factorization.

21105657476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035874 (or 1035872 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 21105657476 in words is "twenty-one billion, one hundred five million, six hundred fifty-seven thousand, four hundred seventy-six".