21746144 has 24 divisors (see below), whose sum is σ = 48929328. Its totient is φ = 9319680.

The previous prime is 21746141. The next prime is 21746149. The reversal of 21746144 is 44164712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21746141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48317 + ... + 48764.

It is an arithmetic number, because the mean of its divisors is an integer number (2038722).

Almost surely, 2^21746144 is an apocalyptic number.

It is an amenable number.

21746144 is an abundant number, since it is smaller than the sum of its proper divisors (27183184).

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

21746144 is an equidigital number, since it uses as much as digits as its factorization.

21746144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97098 (or 97090 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 21746144 is about 4663.2761016264. The cubic root of 21746144 is about 279.1220116986.

The spelling of 21746144 in words is "twenty-one million, seven hundred forty-six thousand, one hundred forty-four".