21018092 has 12 divisors (see below), whose sum is σ = 36935976. Its totient is φ = 10464960.

The previous prime is 21018091. The next prime is 21018097. The reversal of 21018092 is 29081012.

It is a super-3 number, since 3×21018092³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21018091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9938 + ... + 11865.

It is an arithmetic number, because the mean of its divisors is an integer number (3077998).

Almost surely, 2^21018092 is an apocalyptic number.

It is an amenable number.

21018092 is a deficient number, since it is larger than the sum of its proper divisors (15917884).

21018092 is a wasteful number, since it uses less digits than its factorization.

21018092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22048 (or 22046 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 21018092 is about 4584.5492690122. The cubic root of 21018092 is about 275.9716241919.

The spelling of 21018092 in words is "twenty-one million, eighteen thousand, ninety-two".