21234142753 has 4 divisors (see below), whose sum is σ = 21234514608. Its totient is φ = 21233770900.

The previous prime is 21234142729. The next prime is 21234142789. The reversal of 21234142753 is 35724143212.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234142753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234442753) 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, 80251 + ... + 221152.

It is an arithmetic number, because the mean of its divisors is an integer number (5308628652).

Almost surely, 2^21234142753 is an apocalyptic number.

It is an amenable number.

21234142753 is a deficient number, since it is larger than the sum of its proper divisors (371855).

21234142753 is an equidigital number, since it uses as much as digits as its factorization.

21234142753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371854.

The product of its digits is 40320, while the sum is 34.

Adding to 21234142753 its reverse (35724143212), we get a palindrome (56958285965).

The spelling of 21234142753 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-two thousand, seven hundred fifty-three".