21308802 has 8 divisors (see below), whose sum is σ = 42617616. Its totient is φ = 7102932.

The previous prime is 21308801. The next prime is 21308831. The reversal of 21308802 is 20880312.

It is a sphenic number, since it is the product of 3 distinct primes.

21308802 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21308801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1775728 + ... + 1775739.

It is an arithmetic number, because the mean of its divisors is an integer number (5327202).

Almost surely, 2^21308802 is an apocalyptic number.

21308802 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21308802 is a wasteful number, since it uses less digits than its factorization.

21308802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551472.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21308802 is about 4616.1457949246. The cubic root of 21308802 is about 277.2381622382.

The spelling of 21308802 in words is "twenty-one million, three hundred eight thousand, eight hundred two".