21052104 has 32 divisors (see below), whose sum is σ = 53178720. Its totient is φ = 6944256.

The previous prime is 21052091. The next prime is 21052111. The reversal of 21052104 is 40125012.

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, 2194 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (1661835).

Almost surely, 2^21052104 is an apocalyptic number.

21052104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21052104 is an abundant number, since it is smaller than the sum of its proper divisors (32126616).

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

21052104 is a wasteful number, since it uses less digits than its factorization.

21052104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149 (or 9145 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21052104 is about 4588.2571854681. The cubic root of 21052104 is about 276.1204053524.

Adding to 21052104 its reverse (40125012), we get a palindrome (61177116).

The spelling of 21052104 in words is "twenty-one million, fifty-two thousand, one hundred four".