21951394083259 has 2 divisors, whose sum is σ = 21951394083260. Its totient is φ = 21951394083258.

The previous prime is 21951394083239. The next prime is 21951394083277. The reversal of 21951394083259 is 95238049315912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21951394083259 - 2²⁵ = 21951360528827 is a prime.

It is a super-2 number, since 2×21951394083259² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21951394083197 and 21951394083206.

It is not a weakly prime, because it can be changed into another prime (21951394083239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975697041629 + 10975697041630.

It is an arithmetic number, because the mean of its divisors is an integer number (10975697041630).

Almost surely, 2^{21951394083259} is an apocalyptic number.

21951394083259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21951394083259 is an equidigital number, since it uses as much as digits as its factorization.

21951394083259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20995200, while the sum is 61.

The spelling of 21951394083259 in words is "twenty-one trillion, nine hundred fifty-one billion, three hundred ninety-four million, eighty-three thousand, two hundred fifty-nine".