21444112252 has 12 divisors (see below), whose sum is σ = 37528694280. Its totient is φ = 10721628176.

The previous prime is 21444112247. The next prime is 21444112303. The reversal of 21444112252 is 25221144412.

It is a self number, because there is not a number n which added to its sum of digits gives 21444112252.

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, 23418 + ... + 208414.

It is an arithmetic number, because the mean of its divisors is an integer number (3127391190).

Almost surely, 2^21444112252 is an apocalyptic number.

It is an amenable number.

21444112252 is a deficient number, since it is larger than the sum of its proper divisors (16084582028).

21444112252 is a wasteful number, since it uses less digits than its factorization.

21444112252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213980 (or 213978 counting only the distinct ones).

The product of its digits is 5120, while the sum is 28.

Adding to 21444112252 its reverse (25221144412), we get a palindrome (46665256664).

The spelling of 21444112252 in words is "twenty-one billion, four hundred forty-four million, one hundred twelve thousand, two hundred fifty-two".