221005344913 has 2 divisors, whose sum is σ = 221005344914. Its totient is φ = 221005344912.

The previous prime is 221005344899. The next prime is 221005344929. The reversal of 221005344913 is 319443500122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211621160529 + 9384184384 = 460023^2 + 96872^2 .

It is a cyclic number.

It is not a de Polignac number, because 221005344913 - 2⁹ = 221005344401 is a prime.

It is a super-2 number, since 2×221005344913² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221045344913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110502672456 + 110502672457.

It is an arithmetic number, because the mean of its divisors is an integer number (110502672457).

Almost surely, 2^221005344913 is an apocalyptic number.

It is an amenable number.

221005344913 is a deficient number, since it is larger than the sum of its proper divisors (1).

221005344913 is an equidigital number, since it uses as much as digits as its factorization.

221005344913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 221005344913 in words is "two hundred twenty-one billion, five million, three hundred forty-four thousand, nine hundred thirteen".