21457068 has 24 divisors (see below), whose sum is σ = 52243968. Its totient is φ = 6841296.

The previous prime is 21457067. The next prime is 21457069. The reversal of 21457068 is 86075412.

It is an interprime number because it is at equal distance from previous prime (21457067) and next prime (21457069).

It is not an unprimeable number, because it can be changed into a prime (21457067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38596 + ... + 39147.

It is an arithmetic number, because the mean of its divisors is an integer number (2176832).

Almost surely, 2^21457068 is an apocalyptic number.

It is an amenable number.

21457068 is an abundant number, since it is smaller than the sum of its proper divisors (30786900).

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

21457068 is a wasteful number, since it uses less digits than its factorization.

21457068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77773 (or 77771 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21457068 is about 4632.1774577406. The cubic root of 21457068 is about 277.8796815568.

The spelling of 21457068 in words is "twenty-one million, four hundred fifty-seven thousand, sixty-eight".