21200200191 has 12 divisors (see below), whose sum is σ = 30735513120. Its totient is φ = 14081312160.

The previous prime is 21200200169. The next prime is 21200200201. The reversal of 21200200191 is 19100200212.

It is not a de Polignac number, because 21200200191 - 2¹⁷ = 21200069119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200200111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4343646 + ... + 4348523.

It is an arithmetic number, because the mean of its divisors is an integer number (2561292760).

Almost surely, 2^21200200191 is an apocalyptic number.

21200200191 is a deficient number, since it is larger than the sum of its proper divisors (9535312929).

21200200191 is a wasteful number, since it uses less digits than its factorization.

21200200191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8692446 (or 8692443 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21200200191 in words is "twenty-one billion, two hundred million, two hundred thousand, one hundred ninety-one".