9999100121211 has 12 divisors (see below), whose sum is σ = 14443762970520. Its totient is φ = 6665781354720.

The previous prime is 9999100121209. The next prime is 9999100121273. The reversal of 9999100121211 is 1121210019999.

It is not a de Polignac number, because 9999100121211 - 2¹ = 9999100121209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9999100121011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23560725 + ... + 23981366.

It is an arithmetic number, because the mean of its divisors is an integer number (1203646914210).

Almost surely, 2^{9999100121211} is an apocalyptic number.

9999100121211 is a deficient number, since it is larger than the sum of its proper divisors (4444662849309).

9999100121211 is a wasteful number, since it uses less digits than its factorization.

9999100121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47565466 (or 47565463 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 9999100121211 in words is "nine trillion, nine hundred ninety-nine billion, one hundred million, one hundred twenty-one thousand, two hundred eleven".