21540092 has 12 divisors (see below), whose sum is σ = 43080240. Its totient is φ = 9231456.

The previous prime is 21540083. The next prime is 21540157. The reversal of 21540092 is 29004512.

21540092 is an admirable number.

It is a super-3 number, since 3×21540092³ (a number of 23 digits) contains 333 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 384617 + ... + 384672.

It is an arithmetic number, because the mean of its divisors is an integer number (3590020).

Almost surely, 2^21540092 is an apocalyptic number.

It is an amenable number.

21540092 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21540092 is a wasteful number, since it uses less digits than its factorization.

21540092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769300 (or 769298 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21540092 is about 4641.1304657378. The cubic root of 21540092 is about 278.2376209644.

The spelling of 21540092 in words is "twenty-one million, five hundred forty thousand, ninety-two".