2101021100281 has 2 divisors, whose sum is σ = 2101021100282. Its totient is φ = 2101021100280.

The previous prime is 2101021100209. The next prime is 2101021100287. The reversal of 2101021100281 is 1820011201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1421865456400 + 679155643881 = 1192420^2 + 824109^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101021100281 - 2²³ = 2101012711673 is a prime.

It is a super-2 number, since 2×2101021100281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2101021100287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510550140 + 1050510550141.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510550141).

Almost surely, 2^{2101021100281} is an apocalyptic number.

It is an amenable number.

2101021100281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101021100281 is an equidigital number, since it uses as much as digits as its factorization.

2101021100281 is an evil number, because the sum of its binary digits is even.

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

Adding to 2101021100281 its reverse (1820011201012), we get a palindrome (3921032301293).

The spelling of 2101021100281 in words is "two trillion, one hundred one billion, twenty-one million, one hundred thousand, two hundred eighty-one".