21251123110042 has 8 divisors (see below), whose sum is σ = 36430496760096. Its totient is φ = 9107624190012.

The previous prime is 21251123110001. The next prime is 21251123110057. The reversal of 21251123110042 is 24001132115212.

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

It is a super-2 number, since 2×21251123110042² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21251123109989 and 21251123110016.

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, 758968682488 + ... + 758968682515.

It is an arithmetic number, because the mean of its divisors is an integer number (4553812095012).

Almost surely, 2^{21251123110042} is an apocalyptic number.

21251123110042 is a deficient number, since it is larger than the sum of its proper divisors (15179373650054).

21251123110042 is a wasteful number, since it uses less digits than its factorization.

21251123110042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517937365012.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21251123110042 its reverse (24001132115212), we get a palindrome (45252255225254).

The spelling of 21251123110042 in words is "twenty-one trillion, two hundred fifty-one billion, one hundred twenty-three million, one hundred ten thousand, forty-two".