21194212 has 24 divisors (see below), whose sum is σ = 40921272. Its totient is φ = 9542400.

The previous prime is 21194203. The next prime is 21194213. The reversal of 21194212 is 21249112.

It can be written as a sum of positive squares in 4 ways, for example, as 4351396 + 16842816 = 2086^2 + 4104^2 .

It is not an unprimeable number, because it can be changed into a prime (21194213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2839 + ... + 7102.

It is an arithmetic number, because the mean of its divisors is an integer number (1705053).

Almost surely, 2^21194212 is an apocalyptic number.

It is an amenable number.

21194212 is a deficient number, since it is larger than the sum of its proper divisors (19727060).

21194212 is a wasteful number, since it uses less digits than its factorization.

21194212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999 (or 9997 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 21194212 is about 4603.7171937468. The cubic root of 21194212 is about 276.7403110351.

Multiplying 21194212 by its sum of digits (22), we get a palindrome (466272664).

The spelling of 21194212 in words is "twenty-one million, one hundred ninety-four thousand, two hundred twelve".