1221201121247 has 2 divisors, whose sum is σ = 1221201121248. Its totient is φ = 1221201121246.

The previous prime is 1221201121219. The next prime is 1221201121249. The reversal of 1221201121247 is 7421211021221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221201121247 - 2¹² = 1221201117151 is a prime.

Together with 1221201121249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221201121249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600560623 + 610600560624.

It is an arithmetic number, because the mean of its divisors is an integer number (610600560624).

Almost surely, 2^{1221201121247} is an apocalyptic number.

1221201121247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201121247 is an equidigital number, since it uses as much as digits as its factorization.

1221201121247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 1221201121247 its reverse (7421211021221), we get a palindrome (8642412142468).

The spelling of 1221201121247 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, two hundred forty-seven".