20110211999 has 4 divisors (see below), whose sum is σ = 21293165664. Its totient is φ = 18927258336.

The previous prime is 20110211969. The next prime is 20110212011. The reversal of 20110211999 is 99911201102.

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 20110211999 - 2¹² = 20110207903 is a prime.

It is a super-5 number, since 5×20110211999⁵ (a number of 53 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110211969) 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, 591476807 + ... + 591476840.

It is an arithmetic number, because the mean of its divisors is an integer number (5323291416).

Almost surely, 2^20110211999 is an apocalyptic number.

20110211999 is a deficient number, since it is larger than the sum of its proper divisors (1182953665).

20110211999 is a wasteful number, since it uses less digits than its factorization.

20110211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182953664.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 20110211999 in words is "twenty billion, one hundred ten million, two hundred eleven thousand, nine hundred ninety-nine".