142442721 has 6 divisors (see below), whose sum is σ = 205750610. Its totient is φ = 94961808.

The previous prime is 142442687. The next prime is 142442731. The reversal of 142442721 is 127244241.

It can be written as a sum of positive squares in only one way, i.e., 134096400 + 8346321 = 11580^2 + 2889^2 .

It is not a de Polignac number, because 142442721 - 2¹³ = 142434529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142442731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7913476 + ... + 7913493.

Almost surely, 2^142442721 is an apocalyptic number.

It is an amenable number.

142442721 is a deficient number, since it is larger than the sum of its proper divisors (63307889).

142442721 is a wasteful number, since it uses less digits than its factorization.

142442721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15826975 (or 15826972 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 142442721 is about 11934.9369918739. The cubic root of 142442721 is about 522.2519702200.

Adding to 142442721 its reverse (127244241), we get a palindrome (269686962).

The spelling of 142442721 in words is "one hundred forty-two million, four hundred forty-two thousand, seven hundred twenty-one".