21332090 has 16 divisors (see below), whose sum is σ = 41351688. Its totient is φ = 7876416.

The previous prime is 21332089. The next prime is 21332119. The reversal of 21332090 is 9023312.

It can be written as a sum of positive squares in 4 ways, for example, as 13169641 + 8162449 = 3629^2 + 2857^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81917 + ... + 82176.

Almost surely, 2^21332090 is an apocalyptic number.

21332090 is a deficient number, since it is larger than the sum of its proper divisors (20019598).

21332090 is a wasteful number, since it uses less digits than its factorization.

21332090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164113.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 21332090 is about 4618.6675567744. The cubic root of 21332090 is about 277.3391216407.

The spelling of 21332090 in words is "twenty-one million, three hundred thirty-two thousand, ninety".