221012211131 has 2 divisors, whose sum is σ = 221012211132. Its totient is φ = 221012211130.

The previous prime is 221012211071. The next prime is 221012211139. The reversal of 221012211131 is 131112210122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221012211131 - 2⁶ = 221012211067 is a prime.

It is a super-2 number, since 2×221012211131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221012211139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506105565 + 110506105566.

It is an arithmetic number, because the mean of its divisors is an integer number (110506105566).

Almost surely, 2^221012211131 is an apocalyptic number.

221012211131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012211131 is an equidigital number, since it uses as much as digits as its factorization.

221012211131 is an evil number, because the sum of its binary digits is even.

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

Adding to 221012211131 its reverse (131112210122), we get a palindrome (352124421253).

The spelling of 221012211131 in words is "two hundred twenty-one billion, twelve million, two hundred eleven thousand, one hundred thirty-one".