21104430 has 32 divisors (see below), whose sum is σ = 52022304. Its totient is φ = 5475456.

The previous prime is 21104407. The next prime is 21104453. The reversal of 21104430 is 3440112.

It is an interprime number because it is at equal distance from previous prime (21104407) and next prime (21104453).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8397 + ... + 10616.

It is an arithmetic number, because the mean of its divisors is an integer number (1625697).

Almost surely, 2^21104430 is an apocalyptic number.

21104430 is an abundant number, since it is smaller than the sum of its proper divisors (30917874).

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

21104430 is a wasteful number, since it uses less digits than its factorization.

21104430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19060.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21104430 is about 4593.9558117161. The cubic root of 21104430 is about 276.3489861822.

Adding to 21104430 its reverse (3440112), we get a palindrome (24544542).

The spelling of 21104430 in words is "twenty-one million, one hundred four thousand, four hundred thirty".