211267921 has 2 divisors, whose sum is σ = 211267922. Its totient is φ = 211267920.

The previous prime is 211267919. The next prime is 211267981. The reversal of 211267921 is 129762112.

211267921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203918400 + 7349521 = 14280^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 211267921 - 2¹ = 211267919 is a prime.

Together with 211267919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211267981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105633960 + 105633961.

It is an arithmetic number, because the mean of its divisors is an integer number (105633961).

Almost surely, 2^211267921 is an apocalyptic number.

It is an amenable number.

211267921 is a deficient number, since it is larger than the sum of its proper divisors (1).

211267921 is an equidigital number, since it uses as much as digits as its factorization.

211267921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 211267921 is about 14535.0583418162. The cubic root of 211267921 is about 595.5860534567.

The spelling of 211267921 in words is "two hundred eleven million, two hundred sixty-seven thousand, nine hundred twenty-one".