20201102021081 has 2 divisors, whose sum is σ = 20201102021082. Its totient is φ = 20201102021080.

The previous prime is 20201102021069. The next prime is 20201102021099. The reversal of 20201102021081 is 18012020110202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16646685601225 + 3554416419856 = 4080035^2 + 1885316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201102021081 - 2²⁶ = 20201034912217 is a prime.

It is a super-2 number, since 2×20201102021081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20201102021281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100551010540 + 10100551010541.

It is an arithmetic number, because the mean of its divisors is an integer number (10100551010541).

Almost surely, 2^{20201102021081} is an apocalyptic number.

It is an amenable number.

20201102021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201102021081 is an equidigital number, since it uses as much as digits as its factorization.

20201102021081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20201102021081 its reverse (18012020110202), we get a palindrome (38213122131283).

The spelling of 20201102021081 in words is "twenty trillion, two hundred one billion, one hundred two million, twenty-one thousand, eighty-one".