142355121 has 4 divisors (see below), whose sum is σ = 189806832. Its totient is φ = 94903412.

The previous prime is 142355117. The next prime is 142355123. The reversal of 142355121 is 121553241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142355121 - 2² = 142355117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142355091 and 142355100.

It is not an unprimeable number, because it can be changed into a prime (142355123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23725851 + ... + 23725856.

It is an arithmetic number, because the mean of its divisors is an integer number (47451708).

Almost surely, 2^142355121 is an apocalyptic number.

It is an amenable number.

142355121 is a deficient number, since it is larger than the sum of its proper divisors (47451711).

142355121 is an equidigital number, since it uses as much as digits as its factorization.

142355121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47451710.

The product of its digits is 1200, while the sum is 24.

The square root of 142355121 is about 11931.2665295852. The cubic root of 142355121 is about 522.1448893905.

The spelling of 142355121 in words is "one hundred forty-two million, three hundred fifty-five thousand, one hundred twenty-one".