21101204 has 24 divisors (see below), whose sum is σ = 38304000. Its totient is φ = 10160640.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101204 is 40210112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46772 + ... + 47220.

It is an arithmetic number, because the mean of its divisors is an integer number (1596000).

Almost surely, 2^21101204 is an apocalyptic number.

It is an amenable number.

21101204 is a deficient number, since it is larger than the sum of its proper divisors (17202796).

21101204 is a wasteful number, since it uses less digits than its factorization.

21101204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21101204 is about 4593.6046847764. The cubic root of 21101204 is about 276.3349046638.

Adding to 21101204 its reverse (40210112), we get a palindrome (61311316).

The spelling of 21101204 in words is "twenty-one million, one hundred one thousand, two hundred four".