21342441321 has 48 divisors (see below), whose sum is σ = 31408346112. Its totient is φ = 13964076000.

The previous prime is 21342441299. The next prime is 21342441331. The reversal of 21342441321 is 12314424312.

21342441321 is a `hidden beast` number, since 213 + 4 + 2 + 441 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 21342441321 - 2⁹ = 21342440809 is a prime.

It is a super-3 number, since 3×21342441321³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21342441331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75414846 + ... + 75415128.

It is an arithmetic number, because the mean of its divisors is an integer number (654340544).

Almost surely, 2^21342441321 is an apocalyptic number.

It is an amenable number.

21342441321 is a deficient number, since it is larger than the sum of its proper divisors (10065904791).

21342441321 is a wasteful number, since it uses less digits than its factorization.

21342441321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 911 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21342441321 its reverse (12314424312), we get a palindrome (33656865633).

The spelling of 21342441321 in words is "twenty-one billion, three hundred forty-two million, four hundred forty-one thousand, three hundred twenty-one".