21354204 has 24 divisors (see below), whose sum is σ = 50295168. Its totient is φ = 7051120.

The previous prime is 21354197. The next prime is 21354241. The reversal of 21354204 is 40245312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7032 + ... + 9599.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21354204 is an apocalyptic number.

It is an amenable number.

21354204 is an abundant number, since it is smaller than the sum of its proper divisors (28940964).

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

21354204 is a wasteful number, since it uses less digits than its factorization.

21354204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16745 (or 16743 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21354204 is about 4621.0609171488. The cubic root of 21354204 is about 277.4349234626.

Adding to 21354204 its reverse (40245312), we get a palindrome (61599516).

The spelling of 21354204 in words is "twenty-one million, three hundred fifty-four thousand, two hundred four".