2102122021081 has 2 divisors, whose sum is σ = 2102122021082. Its totient is φ = 2102122021080.

The previous prime is 2102122021073. The next prime is 2102122021159. The reversal of 2102122021081 is 1801202212012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157649035481 + 944472985600 = 1075941^2 + 971840^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102122021081 - 2³ = 2102122021073 is a prime.

It is a super-2 number, since 2×2102122021081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102122021031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051061010540 + 1051061010541.

It is an arithmetic number, because the mean of its divisors is an integer number (1051061010541).

Almost surely, 2^{2102122021081} is an apocalyptic number.

It is an amenable number.

2102122021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102122021081 is an equidigital number, since it uses as much as digits as its factorization.

2102122021081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 2102122021081 its reverse (1801202212012), we get a palindrome (3903324233093).

The spelling of 2102122021081 in words is "two trillion, one hundred two billion, one hundred twenty-two million, twenty-one thousand, eighty-one".