2221221199969 has 2 divisors, whose sum is σ = 2221221199970. Its totient is φ = 2221221199968.

The previous prime is 2221221199961. The next prime is 2221221199973. The reversal of 2221221199969 is 9699911221222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2035438649344 + 185782550625 = 1426688^2 + 431025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221221199969 - 2³ = 2221221199961 is a prime.

It is a super-2 number, since 2×2221221199969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2221221199961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110610599984 + 1110610599985.

It is an arithmetic number, because the mean of its divisors is an integer number (1110610599985).

Almost surely, 2^{2221221199969} is an apocalyptic number.

It is an amenable number.

2221221199969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221221199969 is an equidigital number, since it uses as much as digits as its factorization.

2221221199969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 55.

The spelling of 2221221199969 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred sixty-nine".