21701204 has 12 divisors (see below), whose sum is σ = 43402464. Its totient is φ = 9300504.

The previous prime is 21701201. The next prime is 21701219. The reversal of 21701204 is 40210712.

21701204 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387494 + ... + 387549.

It is an arithmetic number, because the mean of its divisors is an integer number (3616872).

Almost surely, 2^21701204 is an apocalyptic number.

It is an amenable number.

21701204 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.

21701204 is a wasteful number, since it uses less digits than its factorization.

21701204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775054 (or 775052 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21701204 is about 4658.4551087244. The cubic root of 21701204 is about 278.9296037327.

Adding to 21701204 its reverse (40210712), we get a palindrome (61911916).

The spelling of 21701204 in words is "twenty-one million, seven hundred one thousand, two hundred four".