142121121 has 8 divisors (see below), whose sum is σ = 199468320. Its totient is φ = 89760672.

The previous prime is 142121113. The next prime is 142121123. The reversal of 142121121 is 121121241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 142121121 - 2³ = 142121113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142121121.

It is not an unprimeable number, because it can be changed into a prime (142121123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246620 + ... + 1246733.

It is an arithmetic number, because the mean of its divisors is an integer number (24933540).

Almost surely, 2^142121121 is an apocalyptic number.

It is an amenable number.

142121121 is a deficient number, since it is larger than the sum of its proper divisors (57347199).

142121121 is a wasteful number, since it uses less digits than its factorization.

142121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493375.

The product of its digits is 32, while the sum is 15.

The square root of 142121121 is about 11921.4563288216. The cubic root of 142121121 is about 521.8586359911.

Adding to 142121121 its reverse (121121241), we get a palindrome (263242362).

The spelling of 142121121 in words is "one hundred forty-two million, one hundred twenty-one thousand, one hundred twenty-one".