1021223221091 has 2 divisors, whose sum is σ = 1021223221092. Its totient is φ = 1021223221090.

The previous prime is 1021223221063. The next prime is 1021223221103. The reversal of 1021223221091 is 1901223221201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021223221091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021223221091.

It is not a weakly prime, because it can be changed into another prime (1021223221021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510611610545 + 510611610546.

It is an arithmetic number, because the mean of its divisors is an integer number (510611610546).

Almost surely, 2^{1021223221091} is an apocalyptic number.

1021223221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021223221091 is an equidigital number, since it uses as much as digits as its factorization.

1021223221091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 1021223221091 its reverse (1901223221201), we get a palindrome (2922446442292).

The spelling of 1021223221091 in words is "one trillion, twenty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, ninety-one".