142210121 has 4 divisors (see below), whose sum is σ = 143618244. Its totient is φ = 140802000.

The previous prime is 142210097. The next prime is 142210141. The reversal of 142210121 is 121012241.

It is a happy number.

142210121 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 77246521 + 64963600 = 8789^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 142210121 - 2²² = 138015817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142210096 and 142210105.

It is not an unprimeable number, because it can be changed into a prime (142210141) 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, 703910 + ... + 704111.

It is an arithmetic number, because the mean of its divisors is an integer number (35904561).

Almost surely, 2^142210121 is an apocalyptic number.

It is an amenable number.

142210121 is a deficient number, since it is larger than the sum of its proper divisors (1408123).

142210121 is a wasteful number, since it uses less digits than its factorization.

142210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408122.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 142210121 is about 11925.1885100404. The cubic root of 142210121 is about 521.9675471474.

Adding to 142210121 its reverse (121012241), we get a palindrome (263222362).

The spelling of 142210121 in words is "one hundred forty-two million, two hundred ten thousand, one hundred twenty-one".