221211101989 has 2 divisors, whose sum is σ = 221211101990. Its totient is φ = 221211101988.

The previous prime is 221211101983. The next prime is 221211102011. The reversal of 221211101989 is 989101112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191107116964 + 30103985025 = 437158^2 + 173505^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211101989 - 2¹³ = 221211093797 is a prime.

It is a super-2 number, since 2×221211101989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211101983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605550994 + 110605550995.

It is an arithmetic number, because the mean of its divisors is an integer number (110605550995).

Almost surely, 2^221211101989 is an apocalyptic number.

It is an amenable number.

221211101989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211101989 is an equidigital number, since it uses as much as digits as its factorization.

221211101989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 221211101989 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred one thousand, nine hundred eighty-nine".