21457326696 has 256 divisors, whose sum is σ = 64864800000. Its totient is φ = 5843238912.

The previous prime is 21457326673. The next prime is 21457326703. The reversal of 21457326696 is 69662375412.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15014910 + ... + 15016338.

It is an arithmetic number, because the mean of its divisors is an integer number (253378125).

Almost surely, 2^21457326696 is an apocalyptic number.

21457326696 is a gapful number since it is divisible by the number (26) 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 21457326696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32432400000).

21457326696 is an abundant number, since it is smaller than the sum of its proper divisors (43407473304).

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

21457326696 is a wasteful number, since it uses less digits than its factorization.

21457326696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1632 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 51.

The spelling of 21457326696 in words is "twenty-one billion, four hundred fifty-seven million, three hundred twenty-six thousand, six hundred ninety-six".