21445254 has 24 divisors (see below), whose sum is σ = 47455200. Its totient is φ = 6996048.

The previous prime is 21445247. The next prime is 21445327. The reversal of 21445254 is 45254412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11829 + ... + 13520.

It is an arithmetic number, because the mean of its divisors is an integer number (1977300).

Almost surely, 2^21445254 is an apocalyptic number.

21445254 is an abundant number, since it is smaller than the sum of its proper divisors (26009946).

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

21445254 is a wasteful number, since it uses less digits than its factorization.

21445254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25404 (or 25401 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 21445254 is about 4630.9020719510. The cubic root of 21445254 is about 277.8286731394.

Adding to 21445254 its reverse (45254412), we get a palindrome (66699666).

The spelling of 21445254 in words is "twenty-one million, four hundred forty-five thousand, two hundred fifty-four".