3912202212221 has 2 divisors, whose sum is σ = 3912202212222. Its totient is φ = 3912202212220.

The previous prime is 3912202212169. The next prime is 3912202212241. The reversal of 3912202212221 is 1222122022193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2666721660100 + 1245480552121 = 1633010^2 + 1116011^2 .

It is an emirp because it is prime and its reverse (1222122022193) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3912202212221 is a prime.

It is a super-2 number, since 2×3912202212221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3912202212241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1956101106110 + 1956101106111.

It is an arithmetic number, because the mean of its divisors is an integer number (1956101106111).

Almost surely, 2^{3912202212221} is an apocalyptic number.

It is an amenable number.

3912202212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3912202212221 is an equidigital number, since it uses as much as digits as its factorization.

3912202212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 3912202212221 in words is "three trillion, nine hundred twelve billion, two hundred two million, two hundred twelve thousand, two hundred twenty-one".