21132230 has 64 divisors (see below), whose sum is σ = 45532800. Its totient is φ = 7056000.

The previous prime is 21132229. The next prime is 21132233. The reversal of 21132230 is 3223112.

It is a happy number.

It is a super-2 number, since 2×21132230² = 893142289545800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209180 + ... + 209280.

It is an arithmetic number, because the mean of its divisors is an integer number (711450).

Almost surely, 2^21132230 is an apocalyptic number.

21132230 is an abundant number, since it is smaller than the sum of its proper divisors (24400570).

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

21132230 is a wasteful number, since it uses less digits than its factorization.

21132230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21132230 is about 4596.9805307397. The cubic root of 21132230 is about 276.4702740035.

Adding to 21132230 its reverse (3223112), we get a palindrome (24355342).

The spelling of 21132230 in words is "twenty-one million, one hundred thirty-two thousand, two hundred thirty".