21047196 has 24 divisors (see below), whose sum is σ = 49916944. Its totient is φ = 6900480.

The previous prime is 21047189. The next prime is 21047197. The reversal of 21047196 is 69174012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21047197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13645 + ... + 15108.

Almost surely, 2^21047196 is an apocalyptic number.

It is an amenable number.

21047196 is an abundant number, since it is smaller than the sum of its proper divisors (28869748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21047196 is a wasteful number, since it uses less digits than its factorization.

21047196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28821 (or 28819 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21047196 is about 4587.7223106897. The cubic root of 21047196 is about 276.0989458302.

The spelling of 21047196 in words is "twenty-one million, forty-seven thousand, one hundred ninety-six".