21223233331 has 2 divisors, whose sum is σ = 21223233332. Its totient is φ = 21223233330.

The previous prime is 21223233287. The next prime is 21223233349. The reversal of 21223233331 is 13333232212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21223233331 - 2¹⁷ = 21223102259 is a prime.

It is a super-2 number, since 2×21223233331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223233296 and 21223233305.

It is not a weakly prime, because it can be changed into another prime (21223233431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611616665 + 10611616666.

It is an arithmetic number, because the mean of its divisors is an integer number (10611616666).

Almost surely, 2^21223233331 is an apocalyptic number.

21223233331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223233331 is an equidigital number, since it uses as much as digits as its factorization.

21223233331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 25.

Adding to 21223233331 its reverse (13333232212), we get a palindrome (34556465543).

The spelling of 21223233331 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-three thousand, three hundred thirty-one".