221230211281 has 2 divisors, whose sum is σ = 221230211282. Its totient is φ = 221230211280.

The previous prime is 221230211261. The next prime is 221230211311. The reversal of 221230211281 is 182112032122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219062377681 + 2167833600 = 468041^2 + 46560^2 .

It is a cyclic number.

It is not a de Polignac number, because 221230211281 - 2⁵ = 221230211249 is a prime.

It is a super-2 number, since 2×221230211281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221230211261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615105640 + 110615105641.

It is an arithmetic number, because the mean of its divisors is an integer number (110615105641).

Almost surely, 2^221230211281 is an apocalyptic number.

It is an amenable number.

221230211281 is a deficient number, since it is larger than the sum of its proper divisors (1).

221230211281 is an equidigital number, since it uses as much as digits as its factorization.

221230211281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The spelling of 221230211281 in words is "two hundred twenty-one billion, two hundred thirty million, two hundred eleven thousand, two hundred eighty-one".