21194359 has 16 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 19094400.

The previous prime is 21194353. The next prime is 21194387. The reversal of 21194359 is 95349112.

It is not a de Polignac number, because 21194359 - 2³ = 21194351 is a prime.

It is a Duffinian number.

Its product of digits (9720) is a multiple of the sum of its prime divisors (486).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68884 + ... + 69190.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^21194359 is an apocalyptic number.

21194359 is a deficient number, since it is larger than the sum of its proper divisors (2223497).

21194359 is a wasteful number, since it uses less digits than its factorization.

21194359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its digits is 9720, while the sum is 34.

The square root of 21194359 is about 4603.7331590786. The cubic root of 21194359 is about 276.7409508439.

The spelling of 21194359 in words is "twenty-one million, one hundred ninety-four thousand, three hundred fifty-nine".