21948674017471 has 2 divisors, whose sum is σ = 21948674017472. Its totient is φ = 21948674017470.

The previous prime is 21948674017463. The next prime is 21948674017513. The reversal of 21948674017471 is 17471047684912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21948674017471 - 2³ = 21948674017463 is a prime.

It is a super-3 number, since 3×21948674017471³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21948674018471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974337008735 + 10974337008736.

It is an arithmetic number, because the mean of its divisors is an integer number (10974337008736).

Almost surely, 2^{21948674017471} is an apocalyptic number.

21948674017471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21948674017471 is an equidigital number, since it uses as much as digits as its factorization.

21948674017471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 21948674017471 in words is "twenty-one trillion, nine hundred forty-eight billion, six hundred seventy-four million, seventeen thousand, four hundred seventy-one".