21112101120042 has 48 divisors (see below), whose sum is σ = 47986708798080. Its totient is φ = 6698999210400.

The previous prime is 21112101120041. The next prime is 21112101120049. The reversal of 21112101120042 is 24002110121112.

21112101120042 is a `hidden beast` number, since 211 + 1 + 210 + 1 + 1 + 200 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21112101119997 and 21112101120024.

It is not an unprimeable number, because it can be changed into a prime (21112101120041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284784334 + ... + 284858457.

It is an arithmetic number, because the mean of its divisors is an integer number (999723099960).

Almost surely, 2^{21112101120042} is an apocalyptic number.

21112101120042 is an abundant number, since it is smaller than the sum of its proper divisors (26874607678038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112101120042 is a wasteful number, since it uses less digits than its factorization.

21112101120042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569642899 (or 569642896 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112101120042 its reverse (24002110121112), we get a palindrome (45114211241154).

The spelling of 21112101120042 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, one hundred twenty thousand, forty-two".