142204123121 has 4 divisors (see below), whose sum is σ = 142366272372. Its totient is φ = 142041973872.

The previous prime is 142204123111. The next prime is 142204123169. The reversal of 142204123121 is 121321402241.

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 107085363121 + 35118760000 = 327239^2 + 187400^2 .

It is a cyclic number.

It is not a de Polignac number, because 142204123121 - 2²² = 142199928817 is a prime.

It is a super-2 number, since 2×142204123121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142204123111) 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, 81073310 + ... + 81075063.

It is an arithmetic number, because the mean of its divisors is an integer number (35591568093).

Almost surely, 2^142204123121 is an apocalyptic number.

It is an amenable number.

142204123121 is a deficient number, since it is larger than the sum of its proper divisors (162149251).

142204123121 is an equidigital number, since it uses as much as digits as its factorization.

142204123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162149250.

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

Adding to 142204123121 its reverse (121321402241), we get a palindrome (263525525362).

The spelling of 142204123121 in words is "one hundred forty-two billion, two hundred four million, one hundred twenty-three thousand, one hundred twenty-one".