21221231223 has 8 divisors (see below), whose sum is σ = 29959385328. Its totient is φ = 13315282304.

The previous prime is 21221231219. The next prime is 21221231237. The reversal of 21221231223 is 32213212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221231223 - 2² = 21221231219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221231203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208051236 + ... + 208051337.

It is an arithmetic number, because the mean of its divisors is an integer number (3744923166).

Almost surely, 2^21221231223 is an apocalyptic number.

21221231223 is a deficient number, since it is larger than the sum of its proper divisors (8738154105).

21221231223 is a wasteful number, since it uses less digits than its factorization.

21221231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416102593.

The product of its digits is 576, while the sum is 21.

Adding to 21221231223 its reverse (32213212212), we get a palindrome (53434443435).

The spelling of 21221231223 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-three".