21454044 has 12 divisors (see below), whose sum is σ = 50059464. Its totient is φ = 7151344.

The previous prime is 21454039. The next prime is 21454049. The reversal of 21454044 is 44045412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21454039) and next prime (21454049).

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 (21454049) 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, 893907 + ... + 893930.

It is an arithmetic number, because the mean of its divisors is an integer number (4171622).

Almost surely, 2^21454044 is an apocalyptic number.

It is an amenable number.

21454044 is an abundant number, since it is smaller than the sum of its proper divisors (28605420).

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

21454044 is a wasteful number, since it uses less digits than its factorization.

21454044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787844 (or 1787842 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 21454044 is about 4631.8510338740. The cubic root of 21454044 is about 277.8666268432.

Adding to 21454044 its reverse (44045412), we get a palindrome (65499456).

The spelling of 21454044 in words is "twenty-one million, four hundred fifty-four thousand, forty-four".