21369830 has 8 divisors (see below), whose sum is σ = 38465712. Its totient is φ = 8547928.

The previous prime is 21369811. The next prime is 21369847. The reversal of 21369830 is 3896312.

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

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, 1068482 + ... + 1068501.

It is an arithmetic number, because the mean of its divisors is an integer number (4808214).

Almost surely, 2^21369830 is an apocalyptic number.

21369830 is a deficient number, since it is larger than the sum of its proper divisors (17095882).

21369830 is a wasteful number, since it uses less digits than its factorization.

21369830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136990.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21369830 is about 4622.7513452488. The cubic root of 21369830 is about 277.5025782300.

The spelling of 21369830 in words is "twenty-one million, three hundred sixty-nine thousand, eight hundred thirty".