21795874018351 has 2 divisors, whose sum is σ = 21795874018352. Its totient is φ = 21795874018350.

The previous prime is 21795874018343. The next prime is 21795874018417. The reversal of 21795874018351 is 15381047859712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21795874018351 - 2³ = 21795874018343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21795874018351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21795874018301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897937009175 + 10897937009176.

It is an arithmetic number, because the mean of its divisors is an integer number (10897937009176).

Almost surely, 2^{21795874018351} is an apocalyptic number.

21795874018351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21795874018351 is an equidigital number, since it uses as much as digits as its factorization.

21795874018351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 61.

The spelling of 21795874018351 in words is "twenty-one trillion, seven hundred ninety-five billion, eight hundred seventy-four million, eighteen thousand, three hundred fifty-one".