21663205123042 has 8 divisors (see below), whose sum is σ = 37136923068096. Its totient is φ = 9284230767012.

The previous prime is 21663205123037. The next prime is 21663205123073. The reversal of 21663205123042 is 24032150236612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21663205122992 and 21663205123010.

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, 773685897238 + ... + 773685897265.

It is an arithmetic number, because the mean of its divisors is an integer number (4642115383512).

Almost surely, 2^{21663205123042} is an apocalyptic number.

21663205123042 is a deficient number, since it is larger than the sum of its proper divisors (15473717945054).

21663205123042 is a wasteful number, since it uses less digits than its factorization.

21663205123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547371794512.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21663205123042 its reverse (24032150236612), we get a palindrome (45695355359654).

The spelling of 21663205123042 in words is "twenty-one trillion, six hundred sixty-three billion, two hundred five million, one hundred twenty-three thousand, forty-two".