21663215032252 has 12 divisors (see below), whose sum is σ = 37912239071560. Its totient is φ = 10831146726096.

The previous prime is 21663215032231. The next prime is 21663215032267. The reversal of 21663215032252 is 25223051236612.

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, 115091718 + ... + 115279789.

Almost surely, 2^{21663215032252} is an apocalyptic number.

It is an amenable number.

21663215032252 is a deficient number, since it is larger than the sum of its proper divisors (16249024039308).

21663215032252 is a wasteful number, since it uses less digits than its factorization.

21663215032252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230395020 (or 230395018 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 21663215032252 its reverse (25223051236612), we get a palindrome (46886266268864).

The spelling of 21663215032252 in words is "twenty-one trillion, six hundred sixty-three billion, two hundred fifteen million, thirty-two thousand, two hundred fifty-two".