21111101022199 has 4 divisors (see below), whose sum is σ = 21112829893720. Its totient is φ = 21109372150680.

The previous prime is 21111101022173. The next prime is 21111101022203. The reversal of 21111101022199 is 99122010111112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111101022199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111101022199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111101022899) 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, 864417444 + ... + 864441865.

It is an arithmetic number, because the mean of its divisors is an integer number (5278207473430).

Almost surely, 2^{21111101022199} is an apocalyptic number.

21111101022199 is a deficient number, since it is larger than the sum of its proper divisors (1728871521).

21111101022199 is a wasteful number, since it uses less digits than its factorization.

21111101022199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728871520.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 21111101022199 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, twenty-two thousand, one hundred ninety-nine".