21200212191 has 8 divisors (see below), whose sum is σ = 28546820784. Its totient is φ = 13993539200.

The previous prime is 21200212133. The next prime is 21200212193. The reversal of 21200212191 is 19121200212.

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

It is a cyclic number.

It is not a de Polignac number, because 21200212191 - 2⁹ = 21200211679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200212193) 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, 34983546 + ... + 34984151.

It is an arithmetic number, because the mean of its divisors is an integer number (3568352598).

Almost surely, 2^21200212191 is an apocalyptic number.

21200212191 is a deficient number, since it is larger than the sum of its proper divisors (7346608593).

21200212191 is a wasteful number, since it uses less digits than its factorization.

21200212191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69967801.

The product of its (nonzero) digits is 144, while the sum is 21.

It can be divided in two parts, 2120021 and 2191, that added together give a palindrome (2122212).

The spelling of 21200212191 in words is "twenty-one billion, two hundred million, two hundred twelve thousand, one hundred ninety-one".