21092156 has 12 divisors (see below), whose sum is σ = 37023168. Its totient is φ = 10514112.

The previous prime is 21092119. The next prime is 21092167. The reversal of 21092156 is 65129012.

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, 6476 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (3085264).

Almost surely, 2^21092156 is an apocalyptic number.

It is an amenable number.

21092156 is a deficient number, since it is larger than the sum of its proper divisors (15931012).

21092156 is a wasteful number, since it uses less digits than its factorization.

21092156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15988 (or 15986 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 21092156 is about 4592.6197317000. The cubic root of 21092156 is about 276.2954024050.

The spelling of 21092156 in words is "twenty-one million, ninety-two thousand, one hundred fifty-six".