21321104 has 20 divisors (see below), whose sum is σ = 47211264. Its totient is φ = 9137568.

The previous prime is 21321101. The next prime is 21321121. The reversal of 21321104 is 40112312.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21321101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95072 + ... + 95295.

Almost surely, 2^21321104 is an apocalyptic number.

It is an amenable number.

21321104 is an abundant number, since it is smaller than the sum of its proper divisors (25890160).

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

21321104 is a wasteful number, since it uses less digits than its factorization.

21321104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190382 (or 190376 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21321104 is about 4617.4780995691. The cubic root of 21321104 is about 277.2915036970.

Adding to 21321104 its reverse (40112312), we get a palindrome (61433416).

The spelling of 21321104 in words is "twenty-one million, three hundred twenty-one thousand, one hundred four".