211000020121021 has 2 divisors, whose sum is σ = 211000020121022. Its totient is φ = 211000020121020.

The previous prime is 211000020121003. The next prime is 211000020121027. The reversal of 211000020121021 is 120121020000112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175206255902500 + 35793764218521 = 13236550^2 + 5982789^2 .

It is a cyclic number.

It is not a de Polignac number, because 211000020121021 - 2²¹ = 211000018023869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211000020120992 and 211000020121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211000020121027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500010060510 + 105500010060511.

It is an arithmetic number, because the mean of its divisors is an integer number (105500010060511).

Almost surely, 2^{211000020121021} is an apocalyptic number.

It is an amenable number.

211000020121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211000020121021 is an equidigital number, since it uses as much as digits as its factorization.

211000020121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211000020121021 its reverse (120121020000112), we get a palindrome (331121040121133).

The spelling of 211000020121021 in words is "two hundred eleven trillion, twenty million, one hundred twenty-one thousand, twenty-one".