21032308 has 48 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 9027200.

The previous prime is 21032299. The next prime is 21032309. The reversal of 21032308 is 80323012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032309) 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, 67473 + ... + 67783.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^21032308 is an apocalyptic number.

It is an amenable number.

21032308 is an abundant number, since it is smaller than the sum of its proper divisors (21424652).

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

21032308 is a wasteful number, since it uses less digits than its factorization.

21032308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21032308 is about 4586.0994319792. The cubic root of 21032308 is about 276.0338297817.

The spelling of 21032308 in words is "twenty-one million, thirty-two thousand, three hundred eight".