142512121 has 4 divisors (see below), whose sum is σ = 142564212. Its totient is φ = 142460032.

The previous prime is 142512091. The next prime is 142512127. The reversal of 142512121 is 121215241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45765225 + 96746896 = 6765^2 + 9836^2 .

It is a cyclic number.

It is not a de Polignac number, because 142512121 - 2⁵ = 142512089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142512127) 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, 21700 + ... + 27493.

It is an arithmetic number, because the mean of its divisors is an integer number (35641053).

Almost surely, 2^142512121 is an apocalyptic number.

It is an amenable number.

142512121 is a deficient number, since it is larger than the sum of its proper divisors (52091).

142512121 is an equidigital number, since it uses as much as digits as its factorization.

142512121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52090.

The product of its digits is 160, while the sum is 19.

The square root of 142512121 is about 11937.8440683400. The cubic root of 142512121 is about 522.3367724989.

Adding to 142512121 its reverse (121215241), we get a palindrome (263727362).

The spelling of 142512121 in words is "one hundred forty-two million, five hundred twelve thousand, one hundred twenty-one".