21740204 has 12 divisors (see below), whose sum is σ = 38091144. Its totient is φ = 10857024.

The previous prime is 21740197. The next prime is 21740219. The reversal of 21740204 is 40204712.

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, 1127 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (3174262).

Almost surely, 2^21740204 is an apocalyptic number.

It is an amenable number.

21740204 is a deficient number, since it is larger than the sum of its proper divisors (16350940).

21740204 is a wasteful number, since it uses less digits than its factorization.

21740204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544 (or 6542 counting only the distinct ones).

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

The square root of 21740204 is about 4662.6391668239. The cubic root of 21740204 is about 279.0965951507.

Adding to 21740204 its reverse (40204712), we get a palindrome (61944916).

The spelling of 21740204 in words is "twenty-one million, seven hundred forty thousand, two hundred four".