21224112142 has 4 divisors (see below), whose sum is σ = 31836168216. Its totient is φ = 10612056070.

The previous prime is 21224112139. The next prime is 21224112157. The reversal of 21224112142 is 24121142212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306028034 + ... + 5306028037.

It is an arithmetic number, because the mean of its divisors is an integer number (7959042054).

Almost surely, 2^21224112142 is an apocalyptic number.

21224112142 is a deficient number, since it is larger than the sum of its proper divisors (10612056074).

21224112142 is a wasteful number, since it uses less digits than its factorization.

21224112142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10612056073.

The product of its digits is 512, while the sum is 22.

Adding to 21224112142 its reverse (24121142212), we get a palindrome (45345254354).

The spelling of 21224112142 in words is "twenty-one billion, two hundred twenty-four million, one hundred twelve thousand, one hundred forty-two".