21182930 has 16 divisors (see below), whose sum is σ = 38193984. Its totient is φ = 8458800.

The previous prime is 21182927. The next prime is 21182933. The reversal of 21182930 is 3928112.

It is an interprime number because it is at equal distance from previous prime (21182927) and next prime (21182933).

It is a self number, because there is not a number n which added to its sum of digits gives 21182930.

It is not an unprimeable number, because it can be changed into a prime (21182933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6005 + ... + 8855.

It is an arithmetic number, because the mean of its divisors is an integer number (2387124).

Almost surely, 2^21182930 is an apocalyptic number.

21182930 is a deficient number, since it is larger than the sum of its proper divisors (17011054).

21182930 is a wasteful number, since it uses less digits than its factorization.

21182930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21182930 is about 4602.4917164510. The cubic root of 21182930 is about 276.6911979667.

The spelling of 21182930 in words is "twenty-one million, one hundred eighty-two thousand, nine hundred thirty".