2121221220247 has 2 divisors, whose sum is σ = 2121221220248. Its totient is φ = 2121221220246.

The previous prime is 2121221220203. The next prime is 2121221220277. The reversal of 2121221220247 is 7420221221212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121221220247 - 2¹⁹ = 2121220695959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121221220277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060610610123 + 1060610610124.

It is an arithmetic number, because the mean of its divisors is an integer number (1060610610124).

Almost surely, 2^{2121221220247} is an apocalyptic number.

2121221220247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121221220247 is an equidigital number, since it uses as much as digits as its factorization.

2121221220247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

Adding to 2121221220247 its reverse (7420221221212), we get a palindrome (9541442441459).

The spelling of 2121221220247 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred forty-seven".