21388802 has 8 divisors (see below), whose sum is σ = 32829456. Its totient is φ = 10445652.

The previous prime is 21388799. The next prime is 21388811. The reversal of 21388802 is 20888312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124268 + ... + 124439.

It is an arithmetic number, because the mean of its divisors is an integer number (4103682).

Almost surely, 2^21388802 is an apocalyptic number.

21388802 is a deficient number, since it is larger than the sum of its proper divisors (11440654).

21388802 is a wasteful number, since it uses less digits than its factorization.

21388802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248752.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 21388802 is about 4624.8029147197. The cubic root of 21388802 is about 277.5846756179.

The spelling of 21388802 in words is "twenty-one million, three hundred eighty-eight thousand, eight hundred two".