221112212197 has 2 divisors, whose sum is σ = 221112212198. Its totient is φ = 221112212196.

The previous prime is 221112212171. The next prime is 221112212263. The reversal of 221112212197 is 791212211122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215765824036 + 5346388161 = 464506^2 + 73119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112212197 is a prime.

It is a super-2 number, since 2×221112212197² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221112212117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556106098 + 110556106099.

It is an arithmetic number, because the mean of its divisors is an integer number (110556106099).

Almost surely, 2^221112212197 is an apocalyptic number.

It is an amenable number.

221112212197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221112212197 is an equidigital number, since it uses as much as digits as its factorization.

221112212197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The spelling of 221112212197 in words is "two hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred ninety-seven".