21194464 has 12 divisors (see below), whose sum is σ = 41726664. Its totient is φ = 10597216.

The previous prime is 21194441. The next prime is 21194479. The reversal of 21194464 is 46449112.

It is a congruent number.

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, 331132 + ... + 331195.

It is an arithmetic number, because the mean of its divisors is an integer number (3477222).

Almost surely, 2^21194464 is an apocalyptic number.

It is an amenable number.

21194464 is a deficient number, since it is larger than the sum of its proper divisors (20532200).

21194464 is an equidigital number, since it uses as much as digits as its factorization.

21194464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662337 (or 662329 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21194464 is about 4603.7445628532. The cubic root of 21194464 is about 276.7414078484.

The spelling of 21194464 in words is "twenty-one million, one hundred ninety-four thousand, four hundred sixty-four".