211221110021197 has 2 divisors, whose sum is σ = 211221110021198. Its totient is φ = 211221110021196.

The previous prime is 211221110021191. The next prime is 211221110021239. The reversal of 211221110021197 is 791120011122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122617840010436 + 88603270010761 = 11073294^2 + 9412931^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221110021197 - 2³¹ = 211218962537549 is a prime.

It is a super-2 number, since 2×211221110021197² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221110021191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610555010598 + 105610555010599.

It is an arithmetic number, because the mean of its divisors is an integer number (105610555010599).

Almost surely, 2^{211221110021197} is an apocalyptic number.

It is an amenable number.

211221110021197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221110021197 is an equidigital number, since it uses as much as digits as its factorization.

211221110021197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 31.

The spelling of 211221110021197 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred ten million, twenty-one thousand, one hundred ninety-seven".