21342004231 has 4 divisors (see below), whose sum is σ = 21345099264. Its totient is φ = 21338909200.

The previous prime is 21342004217. The next prime is 21342004237. The reversal of 21342004231 is 13240024312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21342004231 - 2⁵ = 21342004199 is a prime.

It is a super-2 number, since 2×21342004231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342004237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537150 + ... + 1550971.

It is an arithmetic number, because the mean of its divisors is an integer number (5336274816).

Almost surely, 2^21342004231 is an apocalyptic number.

21342004231 is a deficient number, since it is larger than the sum of its proper divisors (3095033).

21342004231 is an equidigital number, since it uses as much as digits as its factorization.

21342004231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095032.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21342004231 its reverse (13240024312), we get a palindrome (34582028543).

The spelling of 21342004231 in words is "twenty-one billion, three hundred forty-two million, four thousand, two hundred thirty-one".