142191211 has 4 divisors (see below), whose sum is σ = 142817832. Its totient is φ = 141564592.

The previous prime is 142191197. The next prime is 142191229. The reversal of 142191211 is 112191241.

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 142191211 - 2¹¹ = 142189163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142191011) 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, 312970 + ... + 313423.

It is an arithmetic number, because the mean of its divisors is an integer number (35704458).

Almost surely, 2^142191211 is an apocalyptic number.

142191211 is a deficient number, since it is larger than the sum of its proper divisors (626621).

142191211 is an equidigital number, since it uses as much as digits as its factorization.

142191211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626620.

The product of its digits is 144, while the sum is 22.

The square root of 142191211 is about 11924.3956240977. The cubic root of 142191211 is about 521.9444103885.

The spelling of 142191211 in words is "one hundred forty-two million, one hundred ninety-one thousand, two hundred eleven".