142213421 has 4 divisors (see below), whose sum is σ = 162529632. Its totient is φ = 121897212.

The previous prime is 142213411. The next prime is 142213433. The reversal of 142213421 is 124312241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124312241 = 29 ⋅4286629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142213421 is a prime.

It is a super-2 number, since 2×142213421² = 40449314225046482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142213393 and 142213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142213411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10158095 + ... + 10158108.

It is an arithmetic number, because the mean of its divisors is an integer number (40632408).

Almost surely, 2^142213421 is an apocalyptic number.

It is an amenable number.

142213421 is a deficient number, since it is larger than the sum of its proper divisors (20316211).

142213421 is an equidigital number, since it uses as much as digits as its factorization.

142213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20316210.

The product of its digits is 384, while the sum is 20.

The square root of 142213421 is about 11925.3268718304. The cubic root of 142213421 is about 521.9715845525.

Adding to 142213421 its reverse (124312241), we get a palindrome (266525662).

The spelling of 142213421 in words is "one hundred forty-two million, two hundred thirteen thousand, four hundred twenty-one".