21363557376 has 176 divisors, whose sum is σ = 65277618176. Its totient is φ = 6084993024.

The previous prime is 21363557363. The next prime is 21363557393. The reversal of 21363557376 is 67375536312.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7890615 + ... + 7893321.

Almost surely, 2^21363557376 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 21363557376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32638809088).

21363557376 is an abundant number, since it is smaller than the sum of its proper divisors (43914060800).

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

21363557376 is a wasteful number, since it uses less digits than its factorization.

21363557376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3086 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 48.

The spelling of 21363557376 in words is "twenty-one billion, three hundred sixty-three million, five hundred fifty-seven thousand, three hundred seventy-six".