21195930 has 48 divisors (see below), whose sum is σ = 59179680. Its totient is φ = 4844448.

The previous prime is 21195899. The next prime is 21195989. The reversal of 21195930 is 3959112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5740 + ... + 8679.

It is an arithmetic number, because the mean of its divisors is an integer number (1232910).

Almost surely, 2^21195930 is an apocalyptic number.

21195930 is an abundant number, since it is smaller than the sum of its proper divisors (37983750).

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

21195930 is a wasteful number, since it uses less digits than its factorization.

21195930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14443 (or 14436 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 21195930 is about 4603.9037783168. The cubic root of 21195930 is about 276.7477883440.

It can be divided in two parts, 211 and 95930, that added together give a triangular number (96141 = T₄₃₈).

The spelling of 21195930 in words is "twenty-one million, one hundred ninety-five thousand, nine hundred thirty".