21155092 has 12 divisors (see below), whose sum is σ = 42310240. Its totient is φ = 9066456.

The previous prime is 21155087. The next prime is 21155107. The reversal of 21155092 is 29055112.

21155092 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377742 + ... + 377797.

Almost surely, 2^21155092 is an apocalyptic number.

It is an amenable number.

21155092 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.

21155092 is a wasteful number, since it uses less digits than its factorization.

21155092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755550 (or 755548 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 21155092 is about 4599.4664908009. The cubic root of 21155092 is about 276.5699382829.

The spelling of 21155092 in words is "twenty-one million, one hundred fifty-five thousand, ninety-two".