21360830 has 8 divisors (see below), whose sum is σ = 38449512. Its totient is φ = 8544328.

The previous prime is 21360827. The next prime is 21360841. The reversal of 21360830 is 3806312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21360796 and 21360805.

It is a congruent number.

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, 1068032 + ... + 1068051.

It is an arithmetic number, because the mean of its divisors is an integer number (4806189).

Almost surely, 2^21360830 is an apocalyptic number.

21360830 is a deficient number, since it is larger than the sum of its proper divisors (17088682).

21360830 is a wasteful number, since it uses less digits than its factorization.

21360830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136090.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21360830 is about 4621.7777964762. Note that the first 4 decimals coincide. The cubic root of 21360830 is about 277.4636156068.

The spelling of 21360830 in words is "twenty-one million, three hundred sixty thousand, eight hundred thirty".