21412944 has 160 divisors (see below), whose sum is σ = 71939840. Its totient is φ = 5971968.

The previous prime is 21412889. The next prime is 21412949. The reversal of 21412944 is 44921412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412949) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 220704 + ... + 220800.

It is an arithmetic number, because the mean of its divisors is an integer number (449624).

Almost surely, 2^21412944 is an apocalyptic number.

21412944 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 21412944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35969920).

21412944 is an abundant number, since it is smaller than the sum of its proper divisors (50526896).

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

21412944 is a wasteful number, since it uses less digits than its factorization.

21412944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 182 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21412944 is about 4627.4122357966. The cubic root of 21412944 is about 277.6890749427.

The spelling of 21412944 in words is "twenty-one million, four hundred twelve thousand, nine hundred forty-four".