21231302441 has 4 divisors (see below), whose sum is σ = 21393373584. Its totient is φ = 21069231300.

The previous prime is 21231302401. The next prime is 21231302447. The reversal of 21231302441 is 14420313212.

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 not a de Polignac number, because 21231302441 - 2¹⁰ = 21231301417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21231302447) 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, 81035375 + ... + 81035636.

It is an arithmetic number, because the mean of its divisors is an integer number (5348343396).

Almost surely, 2^21231302441 is an apocalyptic number.

It is an amenable number.

21231302441 is a deficient number, since it is larger than the sum of its proper divisors (162071143).

21231302441 is a wasteful number, since it uses less digits than its factorization.

21231302441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162071142.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21231302441 its reverse (14420313212), we get a palindrome (35651615653).

The spelling of 21231302441 in words is "twenty-one billion, two hundred thirty-one million, three hundred two thousand, four hundred forty-one".