142220405231 has 4 divisors (see below), whose sum is σ = 143072024592. Its totient is φ = 141368785872.

The previous prime is 142220405219. The next prime is 142220405267. The reversal of 142220405231 is 132504022241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132504022241 = 467 ⋅283734523.

It is a cyclic number.

It is not a de Polignac number, because 142220405231 - 2⁶ = 142220405167 is a prime.

It is a super-2 number, since 2×142220405231² (a number of 23 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 142220405231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142220401231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425809430 + ... + 425809763.

It is an arithmetic number, because the mean of its divisors is an integer number (35768006148).

Almost surely, 2^142220405231 is an apocalyptic number.

142220405231 is a deficient number, since it is larger than the sum of its proper divisors (851619361).

142220405231 is an equidigital number, since it uses as much as digits as its factorization.

142220405231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851619360.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 142220405231 its reverse (132504022241), we get a palindrome (274724427472).

The spelling of 142220405231 in words is "one hundred forty-two billion, two hundred twenty million, four hundred five thousand, two hundred thirty-one".