212211101261 has 2 divisors, whose sum is σ = 212211101262. Its totient is φ = 212211101260.

The previous prime is 212211101203. The next prime is 212211101273. The reversal of 212211101261 is 162101112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212083275625 + 127825636 = 460525^2 + 11306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212211101261 is a prime.

It is a super-3 number, since 3×212211101261³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212211101161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105550630 + 106105550631.

It is an arithmetic number, because the mean of its divisors is an integer number (106105550631).

Almost surely, 2^212211101261 is an apocalyptic number.

It is an amenable number.

212211101261 is a deficient number, since it is larger than the sum of its proper divisors (1).

212211101261 is an equidigital number, since it uses as much as digits as its factorization.

212211101261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 212211101261 its reverse (162101112212), we get a palindrome (374312213473).

The spelling of 212211101261 in words is "two hundred twelve billion, two hundred eleven million, one hundred one thousand, two hundred sixty-one".