21411204 has 24 divisors (see below), whose sum is σ = 51571968. Its totient is φ = 6906720.

The previous prime is 21411199. The next prime is 21411209. The reversal of 21411204 is 40211412.

It is an interprime number because it is at equal distance from previous prime (21411199) and next prime (21411209).

It is not an unprimeable number, because it can be changed into a prime (21411209) 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 7 ways as a sum of consecutive naturals, for example, 28407 + ... + 29150.

It is an arithmetic number, because the mean of its divisors is an integer number (2148832).

Almost surely, 2^21411204 is an apocalyptic number.

It is an amenable number.

21411204 is an abundant number, since it is smaller than the sum of its proper divisors (30160764).

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

21411204 is a wasteful number, since it uses less digits than its factorization.

21411204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57595 (or 57593 counting only the distinct ones).

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

The square root of 21411204 is about 4627.2242219283. The cubic root of 21411204 is about 277.6815531360.

Adding to 21411204 its reverse (40211412), we get a palindrome (61622616).

The spelling of 21411204 in words is "twenty-one million, four hundred eleven thousand, two hundred four".