21254204 has 6 divisors (see below), whose sum is σ = 37194864. Its totient is φ = 10627100.

The previous prime is 21254183. The next prime is 21254213. The reversal of 21254204 is 40245212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656772 + ... + 2656779.

It is an arithmetic number, because the mean of its divisors is an integer number (6199144).

Almost surely, 2^21254204 is an apocalyptic number.

It is an amenable number.

21254204 is a deficient number, since it is larger than the sum of its proper divisors (15940660).

21254204 is a wasteful number, since it uses less digits than its factorization.

21254204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313555 (or 5313553 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 21254204 is about 4610.2281939184. The cubic root of 21254204 is about 277.0011772987.

Adding to 21254204 its reverse (40245212), we get a palindrome (61499416).

The spelling of 21254204 in words is "twenty-one million, two hundred fifty-four thousand, two hundred four".