21229120 has 112 divisors (see below), whose sum is σ = 56985408. Its totient is φ = 7464960.

The previous prime is 21229111. The next prime is 21229139. The reversal of 21229120 is 2192212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130159 + ... + 130321.

Almost surely, 2^21229120 is an apocalyptic number.

21229120 is a gapful number since it is divisible by the number (20) 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 21229120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28492704).

21229120 is an abundant number, since it is smaller than the sum of its proper divisors (35756288).

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

21229120 is a wasteful number, since it uses less digits than its factorization.

21229120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21229120 is about 4607.5069180632. The cubic root of 21229120 is about 276.8921630575.

The spelling of 21229120 in words is "twenty-one million, two hundred twenty-nine thousand, one hundred twenty".