221320221131 has 2 divisors, whose sum is σ = 221320221132. Its totient is φ = 221320221130.

The previous prime is 221320221113. The next prime is 221320221203. The reversal of 221320221131 is 131122023122.

Together with previous prime (221320221113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221320221131 is a prime.

It is a super-2 number, since 2×221320221131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221320221431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660110565 + 110660110566.

It is an arithmetic number, because the mean of its divisors is an integer number (110660110566).

Almost surely, 2^221320221131 is an apocalyptic number.

221320221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320221131 is an equidigital number, since it uses as much as digits as its factorization.

221320221131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221320221131 its reverse (131122023122), we get a palindrome (352442244253).

The spelling of 221320221131 in words is "two hundred twenty-one billion, three hundred twenty million, two hundred twenty-one thousand, one hundred thirty-one".