21221323023 has 8 divisors (see below), whose sum is σ = 29959514928. Its totient is φ = 13315339904.

The previous prime is 21221323021. The next prime is 21221323049. The reversal of 21221323023 is 32032312212.

It is a happy number.

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 21221323023 - 2¹ = 21221323021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221323021) 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, 208052136 + ... + 208052237.

It is an arithmetic number, because the mean of its divisors is an integer number (3744939366).

Almost surely, 2^21221323023 is an apocalyptic number.

21221323023 is a deficient number, since it is larger than the sum of its proper divisors (8738191905).

21221323023 is a wasteful number, since it uses less digits than its factorization.

21221323023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416104393.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21221323023 its reverse (32032312212), we get a palindrome (53253635235).

The spelling of 21221323023 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-three".