21255702 has 32 divisors (see below), whose sum is σ = 46421088. Its totient is φ = 6448896.

The previous prime is 21255679. The next prime is 21255721. The reversal of 21255702 is 20755212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3828 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (1450659).

Almost surely, 2^21255702 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21255702, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23210544).

21255702 is an abundant number, since it is smaller than the sum of its proper divisors (25165386).

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

21255702 is a wasteful number, since it uses less digits than its factorization.

21255702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21255702 is about 4610.3906558989. The cubic root of 21255702 is about 277.0076848429.

The spelling of 21255702 in words is "twenty-one million, two hundred fifty-five thousand, seven hundred two".