20021011120081 has 2 divisors, whose sum is σ = 20021011120082. Its totient is φ = 20021011120080.

The previous prime is 20021011120063. The next prime is 20021011120091. The reversal of 20021011120081 is 18002111012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19968207216400 + 52803903681 = 4468580^2 + 229791^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021011120081 - 2³³ = 20012421185489 is a prime.

It is a super-2 number, since 2×20021011120081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20021011120091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010505560040 + 10010505560041.

It is an arithmetic number, because the mean of its divisors is an integer number (10010505560041).

Almost surely, 2^{20021011120081} is an apocalyptic number.

It is an amenable number.

20021011120081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021011120081 is an equidigital number, since it uses as much as digits as its factorization.

20021011120081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20021011120081 its reverse (18002111012002), we get a palindrome (38023122132083).

The spelling of 20021011120081 in words is "twenty trillion, twenty-one billion, eleven million, one hundred twenty thousand, eighty-one".