142372121 has 4 divisors (see below), whose sum is σ = 142445412. Its totient is φ = 142298832.

The previous prime is 142372103. The next prime is 142372123. The reversal of 142372121 is 121273241.

142372121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 81360400 + 61011721 = 9020^2 + 7811^2 .

It is a cyclic number.

It is not a de Polignac number, because 142372121 - 2¹⁴ = 142355737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142372123) 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, 33650 + ... + 37643.

It is an arithmetic number, because the mean of its divisors is an integer number (35611353).

Almost surely, 2^142372121 is an apocalyptic number.

It is an amenable number.

142372121 is a deficient number, since it is larger than the sum of its proper divisors (73291).

142372121 is an equidigital number, since it uses as much as digits as its factorization.

142372121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73290.

The product of its digits is 672, while the sum is 23.

The square root of 142372121 is about 11931.9789222073. The cubic root of 142372121 is about 522.1656733514.

The spelling of 142372121 in words is "one hundred forty-two million, three hundred seventy-two thousand, one hundred twenty-one".