21699696384 has 108 divisors (see below), whose sum is σ = 62673675792. Its totient is φ = 7220736000.

The previous prime is 21699696373. The next prime is 21699696409. The reversal of 21699696384 is 48369699612.

21699696384 is a `hidden beast` number, since 2 + 169 + 9 + 6 + 96 + 384 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1376869 + ... + 1392539.

Almost surely, 2^21699696384 is an apocalyptic number.

21699696384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21699696384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31336837896).

21699696384 is an abundant number, since it is smaller than the sum of its proper divisors (40973979408).

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

21699696384 is a wasteful number, since it uses less digits than its factorization.

21699696384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294 (or 16277 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 63.

The spelling of 21699696384 in words is "twenty-one billion, six hundred ninety-nine million, six hundred ninety-six thousand, three hundred eighty-four".