21663365134052 has 24 divisors (see below), whose sum is σ = 38800283676000. Its totient is φ = 10577670397056.

The previous prime is 21663365134027. The next prime is 21663365134139. The reversal of 21663365134052 is 25043156336612.

It is a junction number, because it is equal to n+sod(n) for n = 21663365133988 and 21663365134006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11710802 + ... + 13433897.

It is an arithmetic number, because the mean of its divisors is an integer number (1616678486500).

Almost surely, 2^{21663365134052} is an apocalyptic number.

It is an amenable number.

21663365134052 is a deficient number, since it is larger than the sum of its proper divisors (17136918541948).

21663365134052 is a wasteful number, since it uses less digits than its factorization.

21663365134052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25149755 (or 25149753 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 21663365134052 in words is "twenty-one trillion, six hundred sixty-three billion, three hundred sixty-five million, one hundred thirty-four thousand, fifty-two".