221210210989 has 2 divisors, whose sum is σ = 221210210990. Its totient is φ = 221210210988.

The previous prime is 221210210981. The next prime is 221210211007. The reversal of 221210210989 is 989012012122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182610928900 + 38599282089 = 427330^2 + 196467^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210210989 - 2³ = 221210210981 is a prime.

It is a super-3 number, since 3×221210210989³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210210981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605105494 + 110605105495.

It is an arithmetic number, because the mean of its divisors is an integer number (110605105495).

Almost surely, 2^221210210989 is an apocalyptic number.

It is an amenable number.

221210210989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210210989 is an equidigital number, since it uses as much as digits as its factorization.

221210210989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 221210210989 in words is "two hundred twenty-one billion, two hundred ten million, two hundred ten thousand, nine hundred eighty-nine".