42123400031231 has 4 divisors (see below), whose sum is σ = 42221134138464. Its totient is φ = 42025665924000.

The previous prime is 42123400031227. The next prime is 42123400031311. The reversal of 42123400031231 is 13213000432124.

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 42123400031231 - 2² = 42123400031227 is a prime.

It is a super-2 number, since 2×42123400031231² (a number of 28 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 42123400031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123400031431) 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, 48867052970 + ... + 48867053831.

It is an arithmetic number, because the mean of its divisors is an integer number (10555283534616).

Almost surely, 2^{42123400031231} is an apocalyptic number.

42123400031231 is a deficient number, since it is larger than the sum of its proper divisors (97734107233).

42123400031231 is an equidigital number, since it uses as much as digits as its factorization.

42123400031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97734107232.

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

Adding to 42123400031231 its reverse (13213000432124), we get a palindrome (55336400463355).

The spelling of 42123400031231 in words is "forty-two trillion, one hundred twenty-three billion, four hundred million, thirty-one thousand, two hundred thirty-one".