21211112111099 has 4 divisors (see below), whose sum is σ = 21256924448736. Its totient is φ = 21165299773464.

The previous prime is 21211112111093. The next prime is 21211112111107. The reversal of 21211112111099 is 99011121111212.

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 21211112111099 - 2²⁸ = 21210843675643 is a prime.

It is a super-2 number, since 2×21211112111099² (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 (21211112111093) 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, 22906168124 + ... + 22906169049.

It is an arithmetic number, because the mean of its divisors is an integer number (5314231112184).

Almost surely, 2^{21211112111099} is an apocalyptic number.

21211112111099 is a deficient number, since it is larger than the sum of its proper divisors (45812337637).

21211112111099 is an equidigital number, since it uses as much as digits as its factorization.

21211112111099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45812337636.

The product of its (nonzero) digits is 648, while the sum is 32.

The spelling of 21211112111099 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, one hundred eleven thousand, ninety-nine".