21113203252664 has 16 divisors (see below), whose sum is σ = 39589051688520. Its totient is φ = 10556122802400.

The previous prime is 21113203252657. The next prime is 21113203252679. The reversal of 21113203252664 is 46625230231112.

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, 59665559 + ... + 60018374.

Almost surely, 2^{21113203252664} is an apocalyptic number.

It is an amenable number.

21113203252664 is a deficient number, since it is larger than the sum of its proper divisors (18475848435856).

21113203252664 is a wasteful number, since it uses less digits than its factorization.

21113203252664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119705990 (or 119705986 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 21113203252664 its reverse (46625230231112), we get a palindrome (67738433483776).

The spelling of 21113203252664 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, two hundred fifty-two thousand, six hundred sixty-four".