21142092 has 24 divisors (see below), whose sum is σ = 49928256. Its totient is φ = 6962128.

The previous prime is 21142087. The next prime is 21142109. The reversal of 21142092 is 29024112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9618 + ... + 11609.

It is an arithmetic number, because the mean of its divisors is an integer number (2080344).

Almost surely, 2^21142092 is an apocalyptic number.

It is an amenable number.

21142092 is an abundant number, since it is smaller than the sum of its proper divisors (28786164).

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

21142092 is a wasteful number, since it uses less digits than its factorization.

21142092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21317 (or 21315 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21142092 is about 4598.0530662445. The cubic root of 21142092 is about 276.5132750783.

The spelling of 21142092 in words is "twenty-one million, one hundred forty-two thousand, ninety-two".