21201111199 has 2 divisors, whose sum is σ = 21201111200. Its totient is φ = 21201111198.

The previous prime is 21201111157. The next prime is 21201111301. The reversal of 21201111199 is 99111110212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201111199 - 2¹¹ = 21201109151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201111109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600555599 + 10600555600.

It is an arithmetic number, because the mean of its divisors is an integer number (10600555600).

Almost surely, 2^21201111199 is an apocalyptic number.

21201111199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201111199 is an equidigital number, since it uses as much as digits as its factorization.

21201111199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 21201111199 in words is "twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred ninety-nine".