142402121231 has 4 divisors (see below), whose sum is σ = 143188873464. Its totient is φ = 141615369000.

The previous prime is 142402121189. The next prime is 142402121243. The reversal of 142402121231 is 132121204241.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142402121231 is a prime.

It is a super-2 number, since 2×142402121231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142402121197 and 142402121206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142402121261) 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, 393375845 + ... + 393376206.

It is an arithmetic number, because the mean of its divisors is an integer number (35797218366).

Almost surely, 2^142402121231 is an apocalyptic number.

142402121231 is a deficient number, since it is larger than the sum of its proper divisors (786752233).

142402121231 is an equidigital number, since it uses as much as digits as its factorization.

142402121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786752232.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 142402121231 its reverse (132121204241), we get a palindrome (274523325472).

The spelling of 142402121231 in words is "one hundred forty-two billion, four hundred two million, one hundred twenty-one thousand, two hundred thirty-one".