9901221002011 has 6 divisors (see below), whose sum is σ = 10148604276836. Its totient is φ = 9659727805200.

The previous prime is 9901221001981. The next prime is 9901221002041. The reversal of 9901221002011 is 1102001221099.

It is an interprime number because it is at equal distance from previous prime (9901221001981) and next prime (9901221002041).

It is not a de Polignac number, because 9901221002011 - 2¹¹ = 9901220999963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9901221002041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2945037285 + ... + 2945040646.

Almost surely, 2^{9901221002011} is an apocalyptic number.

9901221002011 is a deficient number, since it is larger than the sum of its proper divisors (247383274825).

9901221002011 is an equidigital number, since it uses as much as digits as its factorization.

9901221002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890078013 (or 5890077972 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 9901221002011 in words is "nine trillion, nine hundred one billion, two hundred twenty-one million, two thousand, eleven".