21429194 has 4 divisors (see below), whose sum is σ = 32143794. Its totient is φ = 10714596.

The previous prime is 21429193. The next prime is 21429209. The reversal of 21429194 is 49192412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 5929225 = 3937^2 + 2435^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21429194.

It is not an unprimeable number, because it can be changed into a prime (21429193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357297 + ... + 5357300.

Almost surely, 2^21429194 is an apocalyptic number.

21429194 is a deficient number, since it is larger than the sum of its proper divisors (10714600).

21429194 is a wasteful number, since it uses less digits than its factorization.

21429194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10714599.

The product of its digits is 5184, while the sum is 32.

The square root of 21429194 is about 4629.1677437743. The cubic root of 21429194 is about 277.7593020363.

The spelling of 21429194 in words is "twenty-one million, four hundred twenty-nine thousand, one hundred ninety-four".