221230211311 has 2 divisors, whose sum is σ = 221230211312. Its totient is φ = 221230211310.

The previous prime is 221230211281. The next prime is 221230211401. The reversal of 221230211311 is 113112032122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221230211311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221230211611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615105655 + 110615105656.

It is an arithmetic number, because the mean of its divisors is an integer number (110615105656).

Almost surely, 2^221230211311 is an apocalyptic number.

221230211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

221230211311 is an equidigital number, since it uses as much as digits as its factorization.

221230211311 is an evil number, because the sum of its binary digits is even.

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

Adding to 221230211311 its reverse (113112032122), we get a palindrome (334342243433).

The spelling of 221230211311 in words is "two hundred twenty-one billion, two hundred thirty million, two hundred eleven thousand, three hundred eleven".