21317802 has 16 divisors (see below), whose sum is σ = 46511712. Its totient is φ = 6459920.

The previous prime is 21317759. The next prime is 21317833. The reversal of 21317802 is 20871312.

It is a super-2 number, since 2×21317802² = 908897364222408, which contains 22 as substring.

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, 161433 + ... + 161564.

It is an arithmetic number, because the mean of its divisors is an integer number (2906982).

Almost surely, 2^21317802 is an apocalyptic number.

21317802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21317802 is an abundant number, since it is smaller than the sum of its proper divisors (25193910).

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

21317802 is a wasteful number, since it uses less digits than its factorization.

21317802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323013.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 21317802 is about 4617.1205312402. The cubic root of 21317802 is about 277.2771882435.

The spelling of 21317802 in words is "twenty-one million, three hundred seventeen thousand, eight hundred two".