21234142775 has 24 divisors (see below), whose sum is σ = 26796618240. Its totient is φ = 16686920160.

The previous prime is 21234142729. The next prime is 21234142789. The reversal of 21234142775 is 57724143212.

It is not a de Polignac number, because 21234142775 - 2⁶ = 21234142711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2306732 + ... + 2315918.

It is an arithmetic number, because the mean of its divisors is an integer number (1116525760).

Almost surely, 2^21234142775 is an apocalyptic number.

21234142775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21234142775 is a deficient number, since it is larger than the sum of its proper divisors (5562475465).

21234142775 is a wasteful number, since it uses less digits than its factorization.

21234142775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823 (or 10818 counting only the distinct ones).

The product of its digits is 94080, while the sum is 38.

Adding to 21234142775 its reverse (57724143212), we get a palindrome (78958285987).

The spelling of 21234142775 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-two thousand, seven hundred seventy-five".