211000121021 has 2 divisors, whose sum is σ = 211000121022. Its totient is φ = 211000121020.

The previous prime is 211000120999. The next prime is 211000121063. The reversal of 211000121021 is 120121000112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169653372100 + 41346748921 = 411890^2 + 203339^2 .

It is a cyclic number.

It is not a de Polignac number, because 211000121021 - 2¹⁸ = 210999858877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211000120993 and 211000121011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211000121081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500060510 + 105500060511.

It is an arithmetic number, because the mean of its divisors is an integer number (105500060511).

Almost surely, 2^211000121021 is an apocalyptic number.

It is an amenable number.

211000121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211000121021 is an equidigital number, since it uses as much as digits as its factorization.

211000121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211000121021 its reverse (120121000112), we get a palindrome (331121121133).

The spelling of 211000121021 in words is "two hundred eleven billion, one hundred twenty-one thousand, twenty-one".