21194416 has 10 divisors (see below), whose sum is σ = 41064212. Its totient is φ = 10597200.

The previous prime is 21194387. The next prime is 21194441. The reversal of 21194416 is 61449112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662310 + ... + 662341.

Almost surely, 2^21194416 is an apocalyptic number.

It is an amenable number.

21194416 is a deficient number, since it is larger than the sum of its proper divisors (19869796).

21194416 is a wasteful number, since it uses less digits than its factorization.

21194416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324659 (or 1324653 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 21194416 is about 4603.7393497026. The cubic root of 21194416 is about 276.7411989323.

It can be divided in two parts, 2 and 1194416, that multiplied together give a palindrome (2388832).

The spelling of 21194416 in words is "twenty-one million, one hundred ninety-four thousand, four hundred sixteen".