221012211071 has 2 divisors, whose sum is σ = 221012211072. Its totient is φ = 221012211070.

The previous prime is 221012211067. The next prime is 221012211131. The reversal of 221012211071 is 170112210122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221012211071 - 2² = 221012211067 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012211011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506105535 + 110506105536.

It is an arithmetic number, because the mean of its divisors is an integer number (110506105536).

Almost surely, 2^221012211071 is an apocalyptic number.

221012211071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012211071 is an equidigital number, since it uses as much as digits as its factorization.

221012211071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 221012211071 its reverse (170112210122), we get a palindrome (391124421193).

The spelling of 221012211071 in words is "two hundred twenty-one billion, twelve million, two hundred eleven thousand, seventy-one".