21470204 has 12 divisors (see below), whose sum is σ = 42940464. Its totient is φ = 9201504.

The previous prime is 21470149. The next prime is 21470219. The reversal of 21470204 is 40207412.

21470204 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383369 + ... + 383424.

It is an arithmetic number, because the mean of its divisors is an integer number (3578372).

Almost surely, 2^21470204 is an apocalyptic number.

It is an amenable number.

21470204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21470204 is a wasteful number, since it uses less digits than its factorization.

21470204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766804 (or 766802 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 21470204 is about 4633.5951484781. The cubic root of 21470204 is about 277.9363758958.

Adding to 21470204 its reverse (40207412), we get a palindrome (61677616).

The spelling of 21470204 in words is "twenty-one million, four hundred seventy thousand, two hundred four".