21814930 has 16 divisors (see below), whose sum is σ = 39320064. Its totient is φ = 8714160.

The previous prime is 21814913. The next prime is 21814951. The reversal of 21814930 is 3941812.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13969 + ... + 15451.

It is an arithmetic number, because the mean of its divisors is an integer number (2457504).

Almost surely, 2^21814930 is an apocalyptic number.

21814930 is a deficient number, since it is larger than the sum of its proper divisors (17505134).

21814930 is a wasteful number, since it uses less digits than its factorization.

21814930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21814930 is about 4670.6455656579. The cubic root of 21814930 is about 279.4160021866.

The spelling of 21814930 in words is "twenty-one million, eight hundred fourteen thousand, nine hundred thirty".