20111210211999 has 16 divisors (see below), whose sum is σ = 27794216222208. Its totient is φ = 12926354223552.

The previous prime is 20111210211991. The next prime is 20111210212001. The reversal of 20111210211999 is 99911201211102.

It is not a de Polignac number, because 20111210211999 - 2³ = 20111210211991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111210211991) 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, 1064413662 + ... + 1064432555.

It is an arithmetic number, because the mean of its divisors is an integer number (1737138513888).

Almost surely, 2^{20111210211999} is an apocalyptic number.

20111210211999 is a deficient number, since it is larger than the sum of its proper divisors (7683006010209).

20111210211999 is a wasteful number, since it uses less digits than its factorization.

20111210211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128846334.

The product of its (nonzero) digits is 5832, while the sum is 39.

The spelling of 20111210211999 in words is "twenty trillion, one hundred eleven billion, two hundred ten million, two hundred eleven thousand, nine hundred ninety-nine".