211022020120721 has 2 divisors, whose sum is σ = 211022020120722. Its totient is φ = 211022020120720.

The previous prime is 211022020120697. The next prime is 211022020120729. The reversal of 211022020120721 is 127021020220112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210398970378496 + 623049742225 = 14505136^2 + 789335^2 .

It is a cyclic number.

It is not a de Polignac number, because 211022020120721 - 2⁶ = 211022020120657 is a prime.

It is not a weakly prime, because it can be changed into another prime (211022020120729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105511010060360 + 105511010060361.

It is an arithmetic number, because the mean of its divisors is an integer number (105511010060361).

Almost surely, 2^{211022020120721} is an apocalyptic number.

It is an amenable number.

211022020120721 is a deficient number, since it is larger than the sum of its proper divisors (1).

211022020120721 is an equidigital number, since it uses as much as digits as its factorization.

211022020120721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 211022020120721 its reverse (127021020220112), we get a palindrome (338043040340833).

The spelling of 211022020120721 in words is "two hundred eleven trillion, twenty-two billion, twenty million, one hundred twenty thousand, seven hundred twenty-one".