221211201131 has 2 divisors, whose sum is σ = 221211201132. Its totient is φ = 221211201130.

The previous prime is 221211201077. The next prime is 221211201139. The reversal of 221211201131 is 131102112122.

It is a happy number.

221211201131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221211201131 - 2¹⁰ = 221211200107 is a prime.

It is a super-2 number, since 2×221211201131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221211201139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605600565 + 110605600566.

It is an arithmetic number, because the mean of its divisors is an integer number (110605600566).

Almost surely, 2^221211201131 is an apocalyptic number.

221211201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211201131 is an equidigital number, since it uses as much as digits as its factorization.

221211201131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221211201131 its reverse (131102112122), we get a palindrome (352313313253).

The spelling of 221211201131 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, one hundred thirty-one".