21344221252 has 12 divisors (see below), whose sum is σ = 37359351036. Its totient is φ = 10670120960.

The previous prime is 21344221219. The next prime is 21344221271. The reversal of 21344221252 is 25212244312.

It can be written as a sum of positive squares in 2 ways, for example, as 15711118336 + 5633102916 = 125344^2 + 75054^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21344221252.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473149 + ... + 516292.

It is an arithmetic number, because the mean of its divisors is an integer number (3113279253).

Almost surely, 2^21344221252 is an apocalyptic number.

It is an amenable number.

21344221252 is a deficient number, since it is larger than the sum of its proper divisors (16015129784).

21344221252 is a wasteful number, since it uses less digits than its factorization.

21344221252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994838 (or 994836 counting only the distinct ones).

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

Adding to 21344221252 its reverse (25212244312), we get a palindrome (46556465564).

The spelling of 21344221252 in words is "twenty-one billion, three hundred forty-four million, two hundred twenty-one thousand, two hundred fifty-two".