21623481684 has 60 divisors (see below), whose sum is σ = 64603495264. Its totient is φ = 6178136976.

The previous prime is 21623481683. The next prime is 21623481689. The reversal of 21623481684 is 48618432612.

21623481684 is a `hidden beast` number, since 2 + 1 + 623 + 4 + 8 + 16 + 8 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623481683) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4764814 + ... + 4769349.

Almost surely, 2^21623481684 is an apocalyptic number.

It is an amenable number.

21623481684 is an abundant number, since it is smaller than the sum of its proper divisors (42980013580).

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

21623481684 is a wasteful number, since it uses less digits than its factorization.

21623481684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9534186 (or 9534175 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The spelling of 21623481684 in words is "twenty-one billion, six hundred twenty-three million, four hundred eighty-one thousand, six hundred eighty-four".