21886230 has 32 divisors (see below), whose sum is σ = 52843104. Its totient is φ = 5801216.

The previous prime is 21886223. The next prime is 21886237. The reversal of 21886230 is 3268812.

It is an interprime number because it is at equal distance from previous prime (21886223) and next prime (21886237).

It is a super-2 number, since 2×21886230² = 958014127225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21886237) 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, 3082 + ... + 7298.

It is an arithmetic number, because the mean of its divisors is an integer number (1651347).

Almost surely, 2^21886230 is an apocalyptic number.

21886230 is an abundant number, since it is smaller than the sum of its proper divisors (30956874).

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

21886230 is a wasteful number, since it uses less digits than its factorization.

21886230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21886230 is about 4678.2721169252. The cubic root of 21886230 is about 279.7200859113.

The spelling of 21886230 in words is "twenty-one million, eight hundred eighty-six thousand, two hundred thirty".