1221522347 has 2 divisors, whose sum is σ = 1221522348. Its totient is φ = 1221522346.

The previous prime is 1221522319. The next prime is 1221522349. The reversal of 1221522347 is 7432251221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221522347 - 2²⁸ = 953086891 is a prime.

Together with 1221522349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221522349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610761173 + 610761174.

It is an arithmetic number, because the mean of its divisors is an integer number (610761174).

Almost surely, 2^1221522347 is an apocalyptic number.

1221522347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221522347 is an equidigital number, since it uses as much as digits as its factorization.

1221522347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 29.

The square root of 1221522347 is about 34950.2839330384. The cubic root of 1221522347 is about 1068.9739915960.

Adding to 1221522347 its reverse (7432251221), we get a palindrome (8653773568).

The spelling of 1221522347 in words is "one billion, two hundred twenty-one million, five hundred twenty-two thousand, three hundred forty-seven".