21000211111191 has 8 divisors (see below), whose sum is σ = 30154149287920. Its totient is φ = 12923206837632.

The previous prime is 21000211111163. The next prime is 21000211111193. The reversal of 21000211111191 is 19111111200012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21000211111191 - 2¹⁰ = 21000211110167 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 (21000211111193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269233475746 + ... + 269233475823.

It is an arithmetic number, because the mean of its divisors is an integer number (3769268660990).

Almost surely, 2^{21000211111191} is an apocalyptic number.

21000211111191 is a deficient number, since it is larger than the sum of its proper divisors (9153938176729).

21000211111191 is a wasteful number, since it uses less digits than its factorization.

21000211111191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538466951585.

The product of its (nonzero) digits is 36, while the sum is 21.

The spelling of 21000211111191 in words is "twenty-one trillion, two hundred eleven million, one hundred eleven thousand, one hundred ninety-one".