142121431 has 6 divisors (see below), whose sum is σ = 147192032. Its totient is φ = 137219880.

The previous prime is 142121417. The next prime is 142121449. The reversal of 142121431 is 134121241.

It is not a de Polignac number, because 142121431 - 2⁹ = 142120919 is a prime.

It is a super-2 number, since 2×142121431² = 40397002298975522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142121399 and 142121408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142121491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83655 + ... + 85336.

Almost surely, 2^142121431 is an apocalyptic number.

142121431 is a deficient number, since it is larger than the sum of its proper divisors (5070601).

142121431 is an equidigital number, since it uses as much as digits as its factorization.

142121431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169049 (or 169020 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 142121431 is about 11921.4693305817. The cubic root of 142121431 is about 521.8590154235.

Adding to 142121431 its reverse (134121241), we get a palindrome (276242672).

The spelling of 142121431 in words is "one hundred forty-two million, one hundred twenty-one thousand, four hundred thirty-one".