20973187379671 has 2 divisors, whose sum is σ = 20973187379672. Its totient is φ = 20973187379670.

The previous prime is 20973187379663. The next prime is 20973187379681. The reversal of 20973187379671 is 17697378137902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20973187379671 - 2³ = 20973187379663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20973187379671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20973187379621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486593689835 + 10486593689836.

It is an arithmetic number, because the mean of its divisors is an integer number (10486593689836).

Almost surely, 2^{20973187379671} is an apocalyptic number.

20973187379671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973187379671 is an equidigital number, since it uses as much as digits as its factorization.

20973187379671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168031584, while the sum is 70.

The spelling of 20973187379671 in words is "twenty trillion, nine hundred seventy-three billion, one hundred eighty-seven million, three hundred seventy-nine thousand, six hundred seventy-one".