221210100989 has 2 divisors, whose sum is σ = 221210100990. Its totient is φ = 221210100988.

The previous prime is 221210100953. The next prime is 221210101001. The reversal of 221210100989 is 989001012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218385178489 + 2824922500 = 467317^2 + 53150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221210100989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210100389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605050494 + 110605050495.

It is an arithmetic number, because the mean of its divisors is an integer number (110605050495).

Almost surely, 2^221210100989 is an apocalyptic number.

It is an amenable number.

221210100989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210100989 is an equidigital number, since it uses as much as digits as its factorization.

221210100989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 221210100989 in words is "two hundred twenty-one billion, two hundred ten million, one hundred thousand, nine hundred eighty-nine".