221221121267 has 2 divisors, whose sum is σ = 221221121268. Its totient is φ = 221221121266.

The previous prime is 221221121197. The next prime is 221221121279. The reversal of 221221121267 is 762121122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221121267 - 2²² = 221216926963 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221126267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610560633 + 110610560634.

It is an arithmetic number, because the mean of its divisors is an integer number (110610560634).

Almost surely, 2^221221121267 is an apocalyptic number.

221221121267 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221121267 is an equidigital number, since it uses as much as digits as its factorization.

221221121267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

Adding to 221221121267 its reverse (762121122122), we get a palindrome (983342243389).

The spelling of 221221121267 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred sixty-seven".