1220122007891 has 2 divisors, whose sum is σ = 1220122007892. Its totient is φ = 1220122007890.

The previous prime is 1220122007843. The next prime is 1220122007893. The reversal of 1220122007891 is 1987002210221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220122007891 - 2¹⁸ = 1220121745747 is a prime.

Together with 1220122007893, 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 (1220122007893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610061003945 + 610061003946.

It is an arithmetic number, because the mean of its divisors is an integer number (610061003946).

Almost surely, 2^{1220122007891} is an apocalyptic number.

1220122007891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220122007891 is an equidigital number, since it uses as much as digits as its factorization.

1220122007891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 1220122007891 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, seven thousand, eight hundred ninety-one".