21142142234 has 8 divisors (see below), whose sum is σ = 31713834720. Its totient is φ = 10570863996.

The previous prime is 21142142233. The next prime is 21142142249. The reversal of 21142142234 is 43224124112.

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

It is not an unprimeable number, because it can be changed into a prime (21142142233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124337 + ... + 240299.

It is an arithmetic number, because the mean of its divisors is an integer number (3964229340).

Almost surely, 2^21142142234 is an apocalyptic number.

21142142234 is a deficient number, since it is larger than the sum of its proper divisors (10571692486).

21142142234 is a wasteful number, since it uses less digits than its factorization.

21142142234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207124.

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

Adding to 21142142234 its reverse (43224124112), we get a palindrome (64366266346).

The spelling of 21142142234 in words is "twenty-one billion, one hundred forty-two million, one hundred forty-two thousand, two hundred thirty-four".