142421223 has 48 divisors (see below), whose sum is σ = 238290944. Its totient is φ = 74027520.

The previous prime is 142421183. The next prime is 142421239. The reversal of 142421223 is 322124241.

It is not a de Polignac number, because 142421223 - 2⁶ = 142421159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142421223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142421263) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187761 + ... + 188517.

Almost surely, 2^142421223 is an apocalyptic number.

142421223 is a deficient number, since it is larger than the sum of its proper divisors (95869721).

142421223 is a wasteful number, since it uses less digits than its factorization.

142421223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 815 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 142421223 is about 11934.0363247310. The cubic root of 142421223 is about 522.2256954768.

Adding to 142421223 its reverse (322124241), we get a palindrome (464545464).

The spelling of 142421223 in words is "one hundred forty-two million, four hundred twenty-one thousand, two hundred twenty-three".