221211020243 has 2 divisors, whose sum is σ = 221211020244. Its totient is φ = 221211020242.

The previous prime is 221211020213. The next prime is 221211020267. The reversal of 221211020243 is 342020112122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221211020243 - 2¹⁸ = 221210758099 is a prime.

It is not a weakly prime, because it can be changed into another prime (221211020213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605510121 + 110605510122.

It is an arithmetic number, because the mean of its divisors is an integer number (110605510122).

Almost surely, 2^221211020243 is an apocalyptic number.

221211020243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211020243 is an equidigital number, since it uses as much as digits as its factorization.

221211020243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221211020243 its reverse (342020112122), we get a palindrome (563231132365).

The spelling of 221211020243 in words is "two hundred twenty-one billion, two hundred eleven million, twenty thousand, two hundred forty-three".