21100704 has 24 divisors (see below), whose sum is σ = 55389600. Its totient is φ = 7033536.

The previous prime is 21100687. The next prime is 21100711. The reversal of 21100704 is 40700112.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109804 + ... + 109995.

It is an arithmetic number, because the mean of its divisors is an integer number (2307900).

Almost surely, 2^21100704 is an apocalyptic number.

21100704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21100704 is an abundant number, since it is smaller than the sum of its proper divisors (34288896).

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

21100704 is a wasteful number, since it uses less digits than its factorization.

21100704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219812 (or 219804 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21100704 is about 4593.5502609637. The cubic root of 21100704 is about 276.3327220310.

Adding to 21100704 its reverse (40700112), we get a palindrome (61800816).

The spelling of 21100704 in words is "twenty-one million, one hundred thousand, seven hundred four".