21442352 has 20 divisors (see below), whose sum is σ = 41671440. Its totient is φ = 10688448.

The previous prime is 21442349. The next prime is 21442357. The reversal of 21442352 is 25324412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21442357) 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, 3878 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (2083572).

Almost surely, 2^21442352 is an apocalyptic number.

It is an amenable number.

21442352 is a deficient number, since it is larger than the sum of its proper divisors (20229088).

21442352 is a wasteful number, since it uses less digits than its factorization.

21442352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100 (or 4094 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 21442352 is about 4630.5887314682. The cubic root of 21442352 is about 277.8161405268.

Adding to 21442352 its reverse (25324412), we get a palindrome (46766764).

The spelling of 21442352 in words is "twenty-one million, four hundred forty-two thousand, three hundred fifty-two".