21400068 has 48 divisors (see below), whose sum is σ = 51941120. Its totient is φ = 6852384.

The previous prime is 21400063. The next prime is 21400069. The reversal of 21400068 is 86000412.

It is not an unprimeable number, because it can be changed into a prime (21400063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34263 + ... + 34881.

Almost surely, 2^21400068 is an apocalyptic number.

It is an amenable number.

21400068 is an abundant number, since it is smaller than the sum of its proper divisors (30541052).

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

21400068 is a wasteful number, since it uses less digits than its factorization.

21400068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21400068 is about 4626.0207522232. The cubic root of 21400068 is about 277.6334039205.

The spelling of 21400068 in words is "twenty-one million, four hundred thousand, sixty-eight".