21632290 has 32 divisors (see below), whose sum is σ = 40098240. Its totient is φ = 8399424.

The previous prime is 21632287. The next prime is 21632323. The reversal of 21632290 is 9223612.

It is a happy 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, 55416 + ... + 55804.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^21632290 is an apocalyptic number.

21632290 is a deficient number, since it is larger than the sum of its proper divisors (18465950).

21632290 is a wasteful number, since it uses less digits than its factorization.

21632290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21632290 is about 4651.0525690428. The cubic root of 21632290 is about 278.6340358329.

The spelling of 21632290 in words is "twenty-one million, six hundred thirty-two thousand, two hundred ninety".