21868688852 has 12 divisors (see below), whose sum is σ = 38275333236. Its totient is φ = 10932879360.

The previous prime is 21868688833. The next prime is 21868688867. The reversal of 21868688852 is 25888686812.

It can be written as a sum of positive squares in 2 ways, for example, as 2834071696 + 19034617156 = 53236^2 + 137966^2 .

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, 332333 + ... + 392660.

It is an arithmetic number, because the mean of its divisors is an integer number (3189611103).

Almost surely, 2^21868688852 is an apocalyptic number.

It is an amenable number.

21868688852 is a deficient number, since it is larger than the sum of its proper divisors (16406644384).

21868688852 is a wasteful number, since it uses less digits than its factorization.

21868688852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732538 (or 732536 counting only the distinct ones).

The product of its digits is 23592960, while the sum is 62.

The spelling of 21868688852 in words is "twenty-one billion, eight hundred sixty-eight million, six hundred eighty-eight thousand, eight hundred fifty-two".