21619251695347 has 2 divisors, whose sum is σ = 21619251695348. Its totient is φ = 21619251695346.

The previous prime is 21619251695341. The next prime is 21619251695387. The reversal of 21619251695347 is 74359615291612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21619251695347 - 2²⁷ = 21619117477619 is a prime.

It is not a weakly prime, because it can be changed into another prime (21619251695341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10809625847673 + 10809625847674.

It is an arithmetic number, because the mean of its divisors is an integer number (10809625847674).

Almost surely, 2^{21619251695347} is an apocalyptic number.

21619251695347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21619251695347 is an equidigital number, since it uses as much as digits as its factorization.

21619251695347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 61.

The spelling of 21619251695347 in words is "twenty-one trillion, six hundred nineteen billion, two hundred fifty-one million, six hundred ninety-five thousand, three hundred forty-seven".