21215426947199 has 2 divisors, whose sum is σ = 21215426947200. Its totient is φ = 21215426947198.

The previous prime is 21215426947171. The next prime is 21215426947237. The reversal of 21215426947199 is 99174962451212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21215426947199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21215426947129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607713473599 + 10607713473600.

It is an arithmetic number, because the mean of its divisors is an integer number (10607713473600).

Almost surely, 2^{21215426947199} is an apocalyptic number.

21215426947199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21215426947199 is an equidigital number, since it uses as much as digits as its factorization.

21215426947199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 62.

The spelling of 21215426947199 in words is "twenty-one trillion, two hundred fifteen billion, four hundred twenty-six million, nine hundred forty-seven thousand, one hundred ninety-nine".