22121012010221 has 2 divisors, whose sum is σ = 22121012010222. Its totient is φ = 22121012010220.

The previous prime is 22121012010113. The next prime is 22121012010281. The reversal of 22121012010221 is 12201021012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20273505817321 + 1847506192900 = 4502611^2 + 1359230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121012010221 - 2¹⁴ = 22121011993837 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 22121012010221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121012010281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060506005110 + 11060506005111.

It is an arithmetic number, because the mean of its divisors is an integer number (11060506005111).

Almost surely, 2^{22121012010221} is an apocalyptic number.

It is an amenable number.

22121012010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121012010221 is an equidigital number, since it uses as much as digits as its factorization.

22121012010221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 22121012010221 its reverse (12201021012122), we get a palindrome (34322033022343).

The spelling of 22121012010221 in words is "twenty-two trillion, one hundred twenty-one billion, twelve million, ten thousand, two hundred twenty-one".