21092250 has 32 divisors (see below), whose sum is σ = 52648128. Its totient is φ = 5624400.

The previous prime is 21092249. The next prime is 21092293. The reversal of 21092250 is 5229012.

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 15 ways as a sum of consecutive naturals, for example, 13312 + ... + 14811.

It is an arithmetic number, because the mean of its divisors is an integer number (1645254).

Almost surely, 2^21092250 is an apocalyptic number.

21092250 is an abundant number, since it is smaller than the sum of its proper divisors (31555878).

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

21092250 is a wasteful number, since it uses less digits than its factorization.

21092250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28143 (or 28133 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21092250 is about 4592.6299654991. The cubic root of 21092250 is about 276.2958128534.

The spelling of 21092250 in words is "twenty-one million, ninety-two thousand, two hundred fifty".