21660535032542 has 24 divisors (see below), whose sum is σ = 37812913526880. Its totient is φ = 9278790615360.

The previous prime is 21660535032449. The next prime is 21660535032557. The reversal of 21660535032542 is 24523053506612.

It is a junction number, because it is equal to n+sod(n) for n = 21660535032493 and 21660535032502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50927942 + ... + 51351497.

It is an arithmetic number, because the mean of its divisors is an integer number (1575538063620).

Almost surely, 2^{21660535032542} is an apocalyptic number.

21660535032542 is a deficient number, since it is larger than the sum of its proper divisors (16152378494338).

21660535032542 is a wasteful number, since it uses less digits than its factorization.

21660535032542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102281616 (or 102281609 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 21660535032542 in words is "twenty-one trillion, six hundred sixty billion, five hundred thirty-five million, thirty-two thousand, five hundred forty-two".