21142234142 has 8 divisors (see below), whose sum is σ = 31714073856. Its totient is φ = 10570876192.

The previous prime is 21142234129. The next prime is 21142234147. The reversal of 21142234142 is 24143224112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142234147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23843 + ... + 207009.

It is an arithmetic number, because the mean of its divisors is an integer number (3964259232).

Almost surely, 2^21142234142 is an apocalyptic number.

21142234142 is a deficient number, since it is larger than the sum of its proper divisors (10571839714).

21142234142 is a wasteful number, since it uses less digits than its factorization.

21142234142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240882.

The product of its digits is 3072, while the sum is 26.

Adding to 21142234142 its reverse (24143224112), we get a palindrome (45285458254).

The spelling of 21142234142 in words is "twenty-one billion, one hundred forty-two million, two hundred thirty-four thousand, one hundred forty-two".