2021557061101 has 2 divisors, whose sum is σ = 2021557061102. Its totient is φ = 2021557061100.

The previous prime is 2021557061077. The next prime is 2021557061129. The reversal of 2021557061101 is 1011607551202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1916289258601 + 105267802500 = 1384301^2 + 324450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021557061101 - 2³³ = 2012967126509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021557061401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010778530550 + 1010778530551.

It is an arithmetic number, because the mean of its divisors is an integer number (1010778530551).

Almost surely, 2^{2021557061101} is an apocalyptic number.

It is an amenable number.

2021557061101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021557061101 is an equidigital number, since it uses as much as digits as its factorization.

2021557061101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 2021557061101 in words is "two trillion, twenty-one billion, five hundred fifty-seven million, sixty-one thousand, one hundred one".