9911210121201 has 4 divisors (see below), whose sum is σ = 13214946828272. Its totient is φ = 6607473414132.

The previous prime is 9911210121199. The next prime is 9911210121223. The reversal of 9911210121201 is 1021210121199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9911210121201 - 2¹ = 9911210121199 is a prime.

It is a super-2 number, since 2×9911210121201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9911210121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1651868353531 + ... + 1651868353536.

It is an arithmetic number, because the mean of its divisors is an integer number (3303736707068).

Almost surely, 2^{9911210121201} is an apocalyptic number.

It is an amenable number.

9911210121201 is a deficient number, since it is larger than the sum of its proper divisors (3303736707071).

9911210121201 is a wasteful number, since it uses less digits than its factorization.

9911210121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303736707070.

The product of its (nonzero) digits is 648, while the sum is 30.

The spelling of 9911210121201 in words is "nine trillion, nine hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred one".