221221201099 has 2 divisors, whose sum is σ = 221221201100. Its totient is φ = 221221201098.

The previous prime is 221221201049. The next prime is 221221201133. The reversal of 221221201099 is 990102122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221201099 - 2⁷ = 221221200971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221221201099.

It is not a weakly prime, because it can be changed into another prime (221221201039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610600549 + 110610600550.

It is an arithmetic number, because the mean of its divisors is an integer number (110610600550).

Almost surely, 2^221221201099 is an apocalyptic number.

221221201099 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221201099 is an equidigital number, since it uses as much as digits as its factorization.

221221201099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

It can be divided in two parts, 22122 and 1201099, that added together give a palindrome (1223221).

The spelling of 221221201099 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, ninety-nine".