21344252 has 12 divisors (see below), whose sum is σ = 37385040. Its totient is φ = 10662816.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344252 is 25244312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6848 + ... + 9464.

It is an arithmetic number, because the mean of its divisors is an integer number (3115420).

Almost surely, 2^21344252 is an apocalyptic number.

It is an amenable number.

21344252 is a deficient number, since it is larger than the sum of its proper divisors (16040788).

21344252 is a wasteful number, since it uses less digits than its factorization.

21344252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660 (or 4658 counting only the distinct ones).

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

The square root of 21344252 is about 4619.9839826562. The cubic root of 21344252 is about 277.3918177992.

Adding to 21344252 its reverse (25244312), we get a palindrome (46588564).

The spelling of 21344252 in words is "twenty-one million, three hundred forty-four thousand, two hundred fifty-two".