21452238 has 24 divisors (see below), whose sum is σ = 48501648. Its totient is φ = 6839712.

The previous prime is 21452237. The next prime is 21452243. The reversal of 21452238 is 83225412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25495 + ... + 26322.

It is an arithmetic number, because the mean of its divisors is an integer number (2020902).

Almost surely, 2^21452238 is an apocalyptic number.

21452238 is an abundant number, since it is smaller than the sum of its proper divisors (27049410).

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

21452238 is a wasteful number, since it uses less digits than its factorization.

21452238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51848 (or 51845 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21452238 is about 4631.6560753147. The cubic root of 21452238 is about 277.8588296930.

The spelling of 21452238 in words is "twenty-one million, four hundred fifty-two thousand, two hundred thirty-eight".