21229104 has 60 divisors (see below), whose sum is σ = 59407656. Its totient is φ = 6529536.

The previous prime is 21229063. The next prime is 21229111. The reversal of 21229104 is 40192212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6804 + ... + 9420.

Almost surely, 2^21229104 is an apocalyptic number.

21229104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21229104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29703828).

21229104 is an abundant number, since it is smaller than the sum of its proper divisors (38178552).

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

21229104 is a wasteful number, since it uses less digits than its factorization.

21229104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2635 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21229104 is about 4607.5051817659. The cubic root of 21229104 is about 276.8920934946.

It can be divided in two parts, 21 and 229104, that multiplied together give a palindrome (4811184).

The spelling of 21229104 in words is "twenty-one million, two hundred twenty-nine thousand, one hundred four".