21252344 has 32 divisors (see below), whose sum is σ = 40830240. Its totient is φ = 10368000.

The previous prime is 21252337. The next prime is 21252347. The reversal of 21252344 is 44325212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88064 + ... + 88304.

It is an arithmetic number, because the mean of its divisors is an integer number (1275945).

Almost surely, 2^21252344 is an apocalyptic number.

It is an amenable number.

21252344 is a deficient number, since it is larger than the sum of its proper divisors (19577896).

21252344 is a wasteful number, since it uses less digits than its factorization.

21252344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 467 counting only the distinct ones).

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

The square root of 21252344 is about 4610.0264641323. The cubic root of 21252344 is about 276.9930967448.

Adding to 21252344 its reverse (44325212), we get a palindrome (65577556).

The spelling of 21252344 in words is "twenty-one million, two hundred fifty-two thousand, three hundred forty-four".