21356230 has 32 divisors (see below), whose sum is σ = 44686080. Its totient is φ = 7196640.

The previous prime is 21356219. The next prime is 21356287. The reversal of 21356230 is 3265312.

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, 1545 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (1396440).

Almost surely, 2^21356230 is an apocalyptic number.

21356230 is an abundant number, since it is smaller than the sum of its proper divisors (23329850).

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

21356230 is a wasteful number, since it uses less digits than its factorization.

21356230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21356230 is about 4621.2801256795. The cubic root of 21356230 is about 277.4436971507.

The spelling of 21356230 in words is "twenty-one million, three hundred fifty-six thousand, two hundred thirty".