21345234142 has 16 divisors (see below), whose sum is σ = 32807245680. Its totient is φ = 10410164352.

The previous prime is 21345234137. The next prime is 21345234199. The reversal of 21345234142 is 24143254312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 106267 + ... + 232342.

It is an arithmetic number, because the mean of its divisors is an integer number (2050452855).

Almost surely, 2^21345234142 is an apocalyptic number.

21345234142 is a deficient number, since it is larger than the sum of its proper divisors (11462011538).

21345234142 is a wasteful number, since it uses less digits than its factorization.

21345234142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339387.

The product of its digits is 23040, while the sum is 31.

Adding to 21345234142 its reverse (24143254312), we get a palindrome (45488488454).

The spelling of 21345234142 in words is "twenty-one billion, three hundred forty-five million, two hundred thirty-four thousand, one hundred forty-two".