142021311 has 4 divisors (see below), whose sum is σ = 189361752. Its totient is φ = 94680872.

The previous prime is 142021301. The next prime is 142021331. The reversal of 142021311 is 113120241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142021311 - 2⁵ = 142021279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142021301) 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, 23670216 + ... + 23670221.

It is an arithmetic number, because the mean of its divisors is an integer number (47340438).

Almost surely, 2^142021311 is an apocalyptic number.

142021311 is a deficient number, since it is larger than the sum of its proper divisors (47340441).

142021311 is an equidigital number, since it uses as much as digits as its factorization.

142021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47340440.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 142021311 is about 11917.2694439624. The cubic root of 142021311 is about 521.7364423107.

Adding to 142021311 its reverse (113120241), we get a palindrome (255141552).

The spelling of 142021311 in words is "one hundred forty-two million, twenty-one thousand, three hundred eleven".