21212211331 has 2 divisors, whose sum is σ = 21212211332. Its totient is φ = 21212211330.

The previous prime is 21212211299. The next prime is 21212211341. The reversal of 21212211331 is 13311221212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212211331 - 2⁵ = 21212211299 is a prime.

It is a super-2 number, since 2×21212211331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212211299 and 21212211308.

It is not a weakly prime, because it can be changed into another prime (21212211341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606105665 + 10606105666.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105666).

Almost surely, 2^21212211331 is an apocalyptic number.

21212211331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212211331 is an equidigital number, since it uses as much as digits as its factorization.

21212211331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 21212211331 its reverse (13311221212), we get a palindrome (34523432543).

The spelling of 21212211331 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, three hundred thirty-one".