21194588 has 6 divisors (see below), whose sum is σ = 37090536. Its totient is φ = 10597292.

The previous prime is 21194587. The next prime is 21194627. The reversal of 21194588 is 88549112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194587) by changing a digit.

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, 2649320 + ... + 2649327.

It is an arithmetic number, because the mean of its divisors is an integer number (6181756).

Almost surely, 2^21194588 is an apocalyptic number.

It is an amenable number.

21194588 is a deficient number, since it is larger than the sum of its proper divisors (15895948).

21194588 is a wasteful number, since it uses less digits than its factorization.

21194588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298651 (or 5298649 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 21194588 is about 4603.7580301315. The cubic root of 21194588 is about 276.7419475470.

The spelling of 21194588 in words is "twenty-one million, one hundred ninety-four thousand, five hundred eighty-eight".