21358092 has 48 divisors (see below), whose sum is σ = 57238272. Its totient is φ = 6072000.

The previous prime is 21358091. The next prime is 21358111. The reversal of 21358092 is 29085312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21358091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20578 + ... + 21590.

It is an arithmetic number, because the mean of its divisors is an integer number (1192464).

Almost surely, 2^21358092 is an apocalyptic number.

It is an amenable number.

21358092 is an abundant number, since it is smaller than the sum of its proper divisors (35880180).

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

21358092 is a wasteful number, since it uses less digits than its factorization.

21358092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21358092 is about 4621.4815806189. The cubic root of 21358092 is about 277.4517601399.

The spelling of 21358092 in words is "twenty-one million, three hundred fifty-eight thousand, ninety-two".