21192474 has 16 divisors (see below), whose sum is σ = 43185312. Its totient is φ = 6930768.

The previous prime is 21192443. The next prime is 21192481. The reversal of 21192474 is 47429112.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 33004 + ... + 33639.

It is an arithmetic number, because the mean of its divisors is an integer number (2699082).

Almost surely, 2^21192474 is an apocalyptic number.

21192474 is an abundant number, since it is smaller than the sum of its proper divisors (21992838).

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

21192474 is a wasteful number, since it uses less digits than its factorization.

21192474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66701.

The product of its digits is 4032, while the sum is 30.

The square root of 21192474 is about 4603.5284293681. The cubic root of 21192474 is about 276.7327462684.

The spelling of 21192474 in words is "twenty-one million, one hundred ninety-two thousand, four hundred seventy-four".