142521331 has 8 divisors (see below), whose sum is σ = 145454400. Its totient is φ = 139614912.

The previous prime is 142521329. The next prime is 142521349. The reversal of 142521331 is 133125241.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 142521331 - 2¹ = 142521329 is a prime.

It is a super-2 number, since 2×142521331² = 40624659580023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142591331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4326 + ... + 17428.

It is an arithmetic number, because the mean of its divisors is an integer number (18181800).

Almost surely, 2^142521331 is an apocalyptic number.

142521331 is a deficient number, since it is larger than the sum of its proper divisors (2933069).

142521331 is a wasteful number, since it uses less digits than its factorization.

142521331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13325.

The product of its digits is 720, while the sum is 22.

The square root of 142521331 is about 11938.2298101519. The cubic root of 142521331 is about 522.3480244495.

Adding to 142521331 its reverse (133125241), we get a palindrome (275646572).

The spelling of 142521331 in words is "one hundred forty-two million, five hundred twenty-one thousand, three hundred thirty-one".