42120122111 has 32 divisors (see below), whose sum is σ = 45100540800. Its totient is φ = 39327129600.

The previous prime is 42120122041. The next prime is 42120122171. The reversal of 42120122111 is 11122102124.

It is a de Polignac number, because none of the positive numbers 2^k-42120122111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42120122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120122171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105037511 + ... + 105037911.

It is an arithmetic number, because the mean of its divisors is an integer number (1409391900).

Almost surely, 2^42120122111 is an apocalyptic number.

42120122111 is a deficient number, since it is larger than the sum of its proper divisors (2980418689).

42120122111 is an frugal number, since it uses more digits than its factorization.

42120122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 42120122111 its reverse (11122102124), we get a palindrome (53242224235).

The spelling of 42120122111 in words is "forty-two billion, one hundred twenty million, one hundred twenty-two thousand, one hundred eleven".