21699884556 has 96 divisors (see below), whose sum is σ = 66370088960. Its totient is φ = 5999961600.

The previous prime is 21699884539. The next prime is 21699884603. The reversal of 21699884556 is 65548899612.

21699884556 is a `hidden beast` number, since 2 + 16 + 99 + 88 + 455 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 21699884493 and 21699884502.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 439525 + ... + 486396.

Almost surely, 2^21699884556 is an apocalyptic number.

It is an amenable number.

21699884556 is an abundant number, since it is smaller than the sum of its proper divisors (44670204404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21699884556 is a wasteful number, since it uses less digits than its factorization.

21699884556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925972 (or 925964 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 63.

The spelling of 21699884556 in words is "twenty-one billion, six hundred ninety-nine million, eight hundred eighty-four thousand, five hundred fifty-six".