21632030 has 48 divisors (see below), whose sum is σ = 45776016. Its totient is φ = 7338240.

The previous prime is 21631997. The next prime is 21632059. The reversal of 21632030 is 3023612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64022 + ... + 64358.

It is an arithmetic number, because the mean of its divisors is an integer number (953667).

Almost surely, 2^21632030 is an apocalyptic number.

21632030 is an abundant number, since it is smaller than the sum of its proper divisors (24143986).

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

21632030 is a wasteful number, since it uses less digits than its factorization.

21632030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21632030 is about 4651.0246182965. The cubic root of 21632030 is about 278.6329195211.

Adding to 21632030 its reverse (3023612), we get a palindrome (24655642).

The spelling of 21632030 in words is "twenty-one million, six hundred thirty-two thousand, thirty".