21324241252 has 24 divisors (see below), whose sum is σ = 39224174976. Its totient is φ = 10124102208.

The previous prime is 21324241249. The next prime is 21324241319. The reversal of 21324241252 is 25214242312.

It is a self number, because there is not a number n which added to its sum of digits gives 21324241252.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833328 + ... + 858535.

It is an arithmetic number, because the mean of its divisors is an integer number (1634340624).

Almost surely, 2^21324241252 is an apocalyptic number.

It is an amenable number.

21324241252 is a deficient number, since it is larger than the sum of its proper divisors (17899933724).

21324241252 is a wasteful number, since it uses less digits than its factorization.

21324241252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692027 (or 1692025 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

Adding to 21324241252 its reverse (25214242312), we get a palindrome (46538483564).

The spelling of 21324241252 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty-one thousand, two hundred fifty-two".