21844207252 has 36 divisors (see below), whose sum is σ = 44519620404. Its totient is φ = 9351054720.

The previous prime is 21844207247. The next prime is 21844207291. The reversal of 21844207252 is 25270244812.

It can be written as a sum of positive squares in 2 ways, for example, as 13095598096 + 8748609156 = 114436^2 + 93534^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108352 + ... + 235432.

Almost surely, 2^21844207252 is an apocalyptic number.

It is an amenable number.

21844207252 is an abundant number, since it is smaller than the sum of its proper divisors (22675413152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21844207252 is a wasteful number, since it uses less digits than its factorization.

21844207252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127976 (or 127967 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 37.

The spelling of 21844207252 in words is "twenty-one billion, eight hundred forty-four million, two hundred seven thousand, two hundred fifty-two".