212011011221 has 2 divisors, whose sum is σ = 212011011222. Its totient is φ = 212011011220.

The previous prime is 212011011211. The next prime is 212011011229. The reversal of 212011011221 is 122110110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208288180996 + 3722830225 = 456386^2 + 61015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212011011221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212011011196 and 212011011205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011011229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005505610 + 106005505611.

It is an arithmetic number, because the mean of its divisors is an integer number (106005505611).

Almost surely, 2^212011011221 is an apocalyptic number.

It is an amenable number.

212011011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011011221 is an equidigital number, since it uses as much as digits as its factorization.

212011011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212011011221 its reverse (122110110212), we get a palindrome (334121121433).

The spelling of 212011011221 in words is "two hundred twelve billion, eleven million, eleven thousand, two hundred twenty-one".