21114204 has 96 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 6171648.

The previous prime is 21114173. The next prime is 21114209. The reversal of 21114204 is 40241112.

21114204 = T₁₆₄ + T₁₆₅ + ... + T₅₀₇.

It is a super-2 number, since 2×21114204² = 891619221107232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254347 + ... + 254429.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^21114204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21114204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941760).

21114204 is an abundant number, since it is smaller than the sum of its proper divisors (34769316).

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

21114204 is a wasteful number, since it uses less digits than its factorization.

21114204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21114204 is about 4595.0194776519. The cubic root of 21114204 is about 276.3916410202.

Adding to 21114204 its reverse (40241112), we get a palindrome (61355316).

The spelling of 21114204 in words is "twenty-one million, one hundred fourteen thousand, two hundred four".