21861292 has 6 divisors (see below), whose sum is σ = 38257268. Its totient is φ = 10930644.

The previous prime is 21861283. The next prime is 21861311. The reversal of 21861292 is 29216812.

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 as a sum of consecutive naturals, namely, 2732658 + ... + 2732665.

Almost surely, 2^21861292 is an apocalyptic number.

It is an amenable number.

21861292 is a deficient number, since it is larger than the sum of its proper divisors (16395976).

21861292 is a wasteful number, since it uses less digits than its factorization.

21861292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465327 (or 5465325 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 21861292 is about 4675.6060569727. The cubic root of 21861292 is about 279.6138043113.

The spelling of 21861292 in words is "twenty-one million, eight hundred sixty-one thousand, two hundred ninety-two".