42111021231 has 20 divisors (see below), whose sum is σ = 63041347512. Its totient is φ = 28013873328.

The previous prime is 42111021221. The next prime is 42111021259. The reversal of 42111021231 is 13212011124.

42111021231 is a `hidden beast` number, since 421 + 1 + 1 + 0 + 212 + 31 = 666.

It is not a de Polignac number, because 42111021231 - 2¹⁰ = 42111020207 is a prime.

It is a super-2 number, since 2×42111021231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42111021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 518800 + ... + 594453.

Almost surely, 2^42111021231 is an apocalyptic number.

42111021231 is a deficient number, since it is larger than the sum of its proper divisors (20930326281).

42111021231 is a wasteful number, since it uses less digits than its factorization.

42111021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113732 (or 1113723 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 42111021231 its reverse (13212011124), we get a palindrome (55323032355).

The spelling of 42111021231 in words is "forty-two billion, one hundred eleven million, twenty-one thousand, two hundred thirty-one".