1001221121099 has 2 divisors, whose sum is σ = 1001221121100. Its totient is φ = 1001221121098.

The previous prime is 1001221121077. The next prime is 1001221121111. The reversal of 1001221121099 is 9901211221001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001221121099 - 2³² = 996926153803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001221121699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610560549 + 500610560550.

It is an arithmetic number, because the mean of its divisors is an integer number (500610560550).

Almost surely, 2^{1001221121099} is an apocalyptic number.

1001221121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001221121099 is an equidigital number, since it uses as much as digits as its factorization.

1001221121099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

It can be divided in two parts, 100122 and 1121099, that added together give a palindrome (1221221).

The spelling of 1001221121099 in words is "one trillion, one billion, two hundred twenty-one million, one hundred twenty-one thousand, ninety-nine".