221000971049 has 2 divisors, whose sum is σ = 221000971050. Its totient is φ = 221000971048.

The previous prime is 221000971039. The next prime is 221000971109. The reversal of 221000971049 is 940179000122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220987428649 + 13542400 = 470093^2 + 3680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000971049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221000971019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500485524 + 110500485525.

It is an arithmetic number, because the mean of its divisors is an integer number (110500485525).

Almost surely, 2^221000971049 is an apocalyptic number.

It is an amenable number.

221000971049 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000971049 is an equidigital number, since it uses as much as digits as its factorization.

221000971049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 221000971049 in words is "two hundred twenty-one billion, nine hundred seventy-one thousand, forty-nine".