21233022321 has 16 divisors (see below), whose sum is σ = 34258322304. Its totient is φ = 11419440384.

The previous prime is 21233022319. The next prime is 21233022341. The reversal of 21233022321 is 12322033212.

It is a happy number.

It is not a de Polignac number, because 21233022321 - 2¹ = 21233022319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21233022301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29737770 + ... + 29738483.

It is an arithmetic number, because the mean of its divisors is an integer number (2141145144).

Almost surely, 2^21233022321 is an apocalyptic number.

21233022321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21233022321 is a deficient number, since it is larger than the sum of its proper divisors (13025299983).

21233022321 is a wasteful number, since it uses less digits than its factorization.

21233022321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59476280.

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

Adding to 21233022321 its reverse (12322033212), we get a palindrome (33555055533).

The spelling of 21233022321 in words is "twenty-one billion, two hundred thirty-three million, twenty-two thousand, three hundred twenty-one".