142221421 has 4 divisors (see below), whose sum is σ = 142437244. Its totient is φ = 142005600.

The previous prime is 142221379. The next prime is 142221493. The reversal of 142221421 is 124122241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118592100 + 23629321 = 10890^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 142221421 - 2¹⁹ = 141697133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142221221) 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, 106920 + ... + 108241.

It is an arithmetic number, because the mean of its divisors is an integer number (35609311).

Almost surely, 2^142221421 is an apocalyptic number.

It is an amenable number.

142221421 is a deficient number, since it is larger than the sum of its proper divisors (215823).

142221421 is an equidigital number, since it uses as much as digits as its factorization.

142221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215822.

The product of its digits is 256, while the sum is 19.

The square root of 142221421 is about 11925.6622876887. The cubic root of 142221421 is about 521.9813719418.

Adding to 142221421 its reverse (124122241), we get a palindrome (266343662).

The spelling of 142221421 in words is "one hundred forty-two million, two hundred twenty-one thousand, four hundred twenty-one".