21712221199 has 2 divisors, whose sum is σ = 21712221200. Its totient is φ = 21712221198.

The previous prime is 21712221173. The next prime is 21712221217. The reversal of 21712221199 is 99112221712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21712221199 - 2⁷ = 21712221071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21712221169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10856110599 + 10856110600.

It is an arithmetic number, because the mean of its divisors is an integer number (10856110600).

Almost surely, 2^21712221199 is an apocalyptic number.

21712221199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21712221199 is an equidigital number, since it uses as much as digits as its factorization.

21712221199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The spelling of 21712221199 in words is "twenty-one billion, seven hundred twelve million, two hundred twenty-one thousand, one hundred ninety-nine".