21392061696 has 216 divisors, whose sum is σ = 65997407840. Its totient is φ = 6643814400.

The previous prime is 21392061643. The next prime is 21392061709. The reversal of 21392061696 is 69616029312.

21392061696 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 20 + 616 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2666331 + ... + 2674341.

Almost surely, 2^21392061696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21392061696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32998703920).

21392061696 is an abundant number, since it is smaller than the sum of its proper divisors (44605346144).

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

21392061696 is a wasteful number, since it uses less digits than its factorization.

21392061696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8113 (or 8096 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 21392061696 in words is "twenty-one billion, three hundred ninety-two million, sixty-one thousand, six hundred ninety-six".