20959120215881 has 2 divisors, whose sum is σ = 20959120215882. Its totient is φ = 20959120215880.

The previous prime is 20959120215851. The next prime is 20959120215991. The reversal of 20959120215881 is 18851202195902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20777333102656 + 181787113225 = 4558216^2 + 426365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20959120215881 - 2²⁶ = 20959053107017 is a prime.

It is a super-2 number, since 2×20959120215881² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20959120215821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479560107940 + 10479560107941.

It is an arithmetic number, because the mean of its divisors is an integer number (10479560107941).

Almost surely, 2^{20959120215881} is an apocalyptic number.

It is an amenable number.

20959120215881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20959120215881 is an equidigital number, since it uses as much as digits as its factorization.

20959120215881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 53.

The spelling of 20959120215881 in words is "twenty trillion, nine hundred fifty-nine billion, one hundred twenty million, two hundred fifteen thousand, eight hundred eighty-one".