9901203221 has 16 divisors (see below), whose sum is σ = 12827472000. Its totient is φ = 7421606208.

The previous prime is 9901203211. The next prime is 9901203239. The reversal of 9901203221 is 1223021099.

It is a cyclic number.

It is not a de Polignac number, because 9901203221 - 2⁶ = 9901203157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901203211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2861546 + ... + 2865003.

It is an arithmetic number, because the mean of its divisors is an integer number (801717000).

Almost surely, 2^9901203221 is an apocalyptic number.

9901203221 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9901203221 is a deficient number, since it is larger than the sum of its proper divisors (2926268779).

9901203221 is a wasteful number, since it uses less digits than its factorization.

9901203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726588.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 9901203221 is about 99504.7899399823. The cubic root of 9901203221 is about 2147.3161550986.

The spelling of 9901203221 in words is "nine billion, nine hundred one million, two hundred three thousand, two hundred twenty-one".