99211212011 has 4 divisors (see below), whose sum is σ = 103524742992. Its totient is φ = 94897681032.

The previous prime is 99211212007. The next prime is 99211212017. The reversal of 99211212011 is 11021211299.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99211212011 - 2² = 99211212007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99211212017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2156765456 + ... + 2156765501.

It is an arithmetic number, because the mean of its divisors is an integer number (25881185748).

Almost surely, 2^99211212011 is an apocalyptic number.

99211212011 is a deficient number, since it is larger than the sum of its proper divisors (4313530981).

99211212011 is a wasteful number, since it uses less digits than its factorization.

99211212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313530980.

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

The spelling of 99211212011 in words is "ninety-nine billion, two hundred eleven million, two hundred twelve thousand, eleven".