1220021220191 has 2 divisors, whose sum is σ = 1220021220192. Its totient is φ = 1220021220190.

The previous prime is 1220021220127. The next prime is 1220021220281. The reversal of 1220021220191 is 1910221200221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220021220191 - 2⁶ = 1220021220127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220021220101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610010610095 + 610010610096.

It is an arithmetic number, because the mean of its divisors is an integer number (610010610096).

Almost surely, 2^{1220021220191} is an apocalyptic number.

1220021220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220021220191 is an equidigital number, since it uses as much as digits as its factorization.

1220021220191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1220021220191 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, one hundred ninety-one".