142221021 has 8 divisors (see below), whose sum is σ = 191759040. Its totient is φ = 93748512.

The previous prime is 142221019. The next prime is 142221043. The reversal of 142221021 is 120122241.

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

It is not a de Polignac number, because 142221021 - 2¹ = 142221019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142221091) 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, 266065 + ... + 266598.

It is an arithmetic number, because the mean of its divisors is an integer number (23969880).

Almost surely, 2^142221021 is an apocalyptic number.

It is an amenable number.

142221021 is a deficient number, since it is larger than the sum of its proper divisors (49538019).

142221021 is an equidigital number, since it uses as much as digits as its factorization.

142221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532755.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 142221021 is about 11925.6455171198. The cubic root of 142221021 is about 521.9808825811.

Adding to 142221021 its reverse (120122241), we get a palindrome (262343262).

The spelling of 142221021 in words is "one hundred forty-two million, two hundred twenty-one thousand, twenty-one".