221220200291 has 2 divisors, whose sum is σ = 221220200292. Its totient is φ = 221220200290.

The previous prime is 221220200233. The next prime is 221220200297. The reversal of 221220200291 is 192002022122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221220200291 - 2¹⁴ = 221220183907 is a prime.

It is not a weakly prime, because it can be changed into another prime (221220200297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610100145 + 110610100146.

It is an arithmetic number, because the mean of its divisors is an integer number (110610100146).

Almost surely, 2^221220200291 is an apocalyptic number.

221220200291 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220200291 is an equidigital number, since it uses as much as digits as its factorization.

221220200291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 221220200291 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred thousand, two hundred ninety-one".