23583821221 has 4 divisors (see below), whose sum is σ = 23584140832. Its totient is φ = 23583501612.

The previous prime is 23583821207. The next prime is 23583821267. The reversal of 23583821221 is 12212838532.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23583821221 - 2⁹ = 23583820709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23583821021) 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, 13600 + ... + 217606.

It is an arithmetic number, because the mean of its divisors is an integer number (5896035208).

Almost surely, 2^23583821221 is an apocalyptic number.

It is an amenable number.

23583821221 is a deficient number, since it is larger than the sum of its proper divisors (319611).

23583821221 is a wasteful number, since it uses less digits than its factorization.

23583821221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319610.

The product of its digits is 46080, while the sum is 37.

The spelling of 23583821221 in words is "twenty-three billion, five hundred eighty-three million, eight hundred twenty-one thousand, two hundred twenty-one".