21450708 has 36 divisors (see below), whose sum is σ = 55548948. Its totient is φ = 6975360.

The previous prime is 21450707. The next prime is 21450727. The reversal of 21450708 is 80705412.

It can be written as a sum of positive squares in 2 ways, for example, as 5673924 + 15776784 = 2382^2 + 3972^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5791 + ... + 8742.

Almost surely, 2^21450708 is an apocalyptic number.

It is an amenable number.

21450708 is an abundant number, since it is smaller than the sum of its proper divisors (34098240).

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

21450708 is a wasteful number, since it uses less digits than its factorization.

21450708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14584 (or 14579 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21450708 is about 4631.4909046656. The cubic root of 21450708 is about 277.8522237915.

The spelling of 21450708 in words is "twenty-one million, four hundred fifty thousand, seven hundred eight".