21194524 has 12 divisors (see below), whose sum is σ = 39943624. Its totient is φ = 9782064.

The previous prime is 21194513. The next prime is 21194527. The reversal of 21194524 is 42549112.

It is a junction number, because it is equal to n+sod(n) for n = 21194492 and 21194501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203742 + ... + 203845.

Almost surely, 2^21194524 is an apocalyptic number.

It is an amenable number.

21194524 is a deficient number, since it is larger than the sum of its proper divisors (18749100).

21194524 is a wasteful number, since it uses less digits than its factorization.

21194524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407604 (or 407602 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 21194524 is about 4603.7510792831. The cubic root of 21194524 is about 276.7416689932.

The spelling of 21194524 in words is "twenty-one million, one hundred ninety-four thousand, five hundred twenty-four".