21223223331 has 4 divisors (see below), whose sum is σ = 28297631112. Its totient is φ = 14148815552.

The previous prime is 21223223279. The next prime is 21223223377. The reversal of 21223223331 is 13332232212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21223223331 - 2¹⁸ = 21222961187 is a prime.

It is a super-2 number, since 2×21223223331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21223223731) 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, 3537203886 + ... + 3537203891.

It is an arithmetic number, because the mean of its divisors is an integer number (7074407778).

Almost surely, 2^21223223331 is an apocalyptic number.

21223223331 is a deficient number, since it is larger than the sum of its proper divisors (7074407781).

21223223331 is an equidigital number, since it uses as much as digits as its factorization.

21223223331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074407780.

The product of its digits is 2592, while the sum is 24.

Adding to 21223223331 its reverse (13332232212), we get a palindrome (34555455543).

The spelling of 21223223331 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, three hundred thirty-one".