211121012100281 has 2 divisors, whose sum is σ = 211121012100282. Its totient is φ = 211121012100280.

The previous prime is 211121012100277. The next prime is 211121012100301. The reversal of 211121012100281 is 182001210121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130314576322681 + 80806435777600 = 11415541^2 + 8989240^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121012100281 - 2² = 211121012100277 is a prime.

It is a super-2 number, since 2×211121012100281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211121012100781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560506050140 + 105560506050141.

It is an arithmetic number, because the mean of its divisors is an integer number (105560506050141).

Almost surely, 2^{211121012100281} is an apocalyptic number.

It is an amenable number.

211121012100281 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121012100281 is an equidigital number, since it uses as much as digits as its factorization.

211121012100281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 211121012100281 its reverse (182001210121112), we get a palindrome (393122222221393).

The spelling of 211121012100281 in words is "two hundred eleven trillion, one hundred twenty-one billion, twelve million, one hundred thousand, two hundred eighty-one".