21342004243 has 12 divisors (see below), whose sum is σ = 24829622712. Its totient is φ = 18290781600.

The previous prime is 21342004241. The next prime is 21342004309. The reversal of 21342004243 is 34240024312.

It is a happy number.

It is not a de Polignac number, because 21342004243 - 2¹ = 21342004241 is a prime.

It is a super-2 number, since 2×21342004243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21342004241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430068 + ... + 477118.

It is an arithmetic number, because the mean of its divisors is an integer number (2069135226).

Almost surely, 2^21342004243 is an apocalyptic number.

21342004243 is a deficient number, since it is larger than the sum of its proper divisors (3487618469).

21342004243 is an equidigital number, since it uses as much as digits as its factorization.

21342004243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56322 (or 56315 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21342004243 its reverse (34240024312), we get a palindrome (55582028555).

The spelling of 21342004243 in words is "twenty-one billion, three hundred forty-two million, four thousand, two hundred forty-three".