21795467919157 has 2 divisors, whose sum is σ = 21795467919158. Its totient is φ = 21795467919156.

The previous prime is 21795467919079. The next prime is 21795467919191. The reversal of 21795467919157 is 75191976459712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21655611366481 + 139856552676 = 4653559^2 + 373974^2 .

It is a cyclic number.

It is not a de Polignac number, because 21795467919157 - 2¹¹ = 21795467917109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21795467919157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21795467919457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897733959578 + 10897733959579.

It is an arithmetic number, because the mean of its divisors is an integer number (10897733959579).

Almost surely, 2^{21795467919157} is an apocalyptic number.

It is an amenable number.

21795467919157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21795467919157 is an equidigital number, since it uses as much as digits as its factorization.

21795467919157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300056400, while the sum is 73.

The spelling of 21795467919157 in words is "twenty-one trillion, seven hundred ninety-five billion, four hundred sixty-seven million, nine hundred nineteen thousand, one hundred fifty-seven".