42121332431 has 4 divisors (see below), whose sum is σ = 43573792200. Its totient is φ = 40668872664.

The previous prime is 42121332403. The next prime is 42121332437. The reversal of 42121332431 is 13423312124.

42121332431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42121332431 - 2¹⁴ = 42121316047 is a prime.

It is a super-2 number, since 2×42121332431² (a number of 22 digits) contains 22 as substring.

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 42121332431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121332437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726229841 + ... + 726229898.

It is an arithmetic number, because the mean of its divisors is an integer number (10893448050).

Almost surely, 2^42121332431 is an apocalyptic number.

42121332431 is a deficient number, since it is larger than the sum of its proper divisors (1452459769).

42121332431 is a wasteful number, since it uses less digits than its factorization.

42121332431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452459768.

The product of its digits is 3456, while the sum is 26.

Adding to 42121332431 its reverse (13423312124), we get a palindrome (55544644555).

The spelling of 42121332431 in words is "forty-two billion, one hundred twenty-one million, three hundred thirty-two thousand, four hundred thirty-one".