1022011212221 has 2 divisors, whose sum is σ = 1022011212222. Its totient is φ = 1022011212220.

The previous prime is 1022011212197. The next prime is 1022011212239. The reversal of 1022011212221 is 1222121102201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586734552196 + 435276660025 = 765986^2 + 659755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022011212221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1022011212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022011212281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511005606110 + 511005606111.

It is an arithmetic number, because the mean of its divisors is an integer number (511005606111).

Almost surely, 2^{1022011212221} is an apocalyptic number.

It is an amenable number.

1022011212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022011212221 is an equidigital number, since it uses as much as digits as its factorization.

1022011212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1022011212221 its reverse (1222121102201), we get a palindrome (2244132314422).

The spelling of 1022011212221 in words is "one trillion, twenty-two billion, eleven million, two hundred twelve thousand, two hundred twenty-one".