21698525376 has 336 divisors, whose sum is σ = 70669241440. Its totient is φ = 6523545600.

The previous prime is 21698525341. The next prime is 21698525413. The reversal of 21698525376 is 67352589612.

21698525376 is a `hidden beast` number, since 2 + 16 + 98 + 5 + 2 + 537 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32826486 + ... + 32827146.

Almost surely, 2^21698525376 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 21698525376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35334620720).

21698525376 is an abundant number, since it is smaller than the sum of its proper divisors (48970716064).

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

21698525376 is a wasteful number, since it uses less digits than its factorization.

21698525376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 834 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 21698525376 in words is "twenty-one billion, six hundred ninety-eight million, five hundred twenty-five thousand, three hundred seventy-six".