21441372 has 12 divisors (see below), whose sum is σ = 50029896. Its totient is φ = 7147120.

The previous prime is 21441347. The next prime is 21441373. The reversal of 21441372 is 27314412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893379 + ... + 893402.

It is an arithmetic number, because the mean of its divisors is an integer number (4169158).

Almost surely, 2^21441372 is an apocalyptic number.

It is an amenable number.

21441372 is an abundant number, since it is smaller than the sum of its proper divisors (28588524).

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

21441372 is a wasteful number, since it uses less digits than its factorization.

21441372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786788 (or 1786786 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 21441372 is about 4630.4829121810. The cubic root of 21441372 is about 277.8119080315.

Adding to 21441372 its reverse (27314412), we get a palindrome (48755784).

The spelling of 21441372 in words is "twenty-one million, four hundred forty-one thousand, three hundred seventy-two".