21111202199 has 4 divisors (see below), whose sum is σ = 21125400864. Its totient is φ = 21097003536.

The previous prime is 21111202193. The next prime is 21111202219. The reversal of 21111202199 is 99120211112.

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-21111202199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111202193) 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, 7097102 + ... + 7100075.

It is an arithmetic number, because the mean of its divisors is an integer number (5281350216).

Almost surely, 2^21111202199 is an apocalyptic number.

21111202199 is a deficient number, since it is larger than the sum of its proper divisors (14198665).

21111202199 is a wasteful number, since it uses less digits than its factorization.

21111202199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14198664.

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

The spelling of 21111202199 in words is "twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred ninety-nine".