211468021 has 2 divisors, whose sum is σ = 211468022. Its totient is φ = 211468020.

The previous prime is 211468009. The next prime is 211468031. The reversal of 211468021 is 120864112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158382225 + 53085796 = 12585^2 + 7286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211468021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211468031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105734010 + 105734011.

It is an arithmetic number, because the mean of its divisors is an integer number (105734011).

Almost surely, 2^211468021 is an apocalyptic number.

It is an amenable number.

211468021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211468021 is an equidigital number, since it uses as much as digits as its factorization.

211468021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 211468021 is about 14541.9400700182. The cubic root of 211468021 is about 595.7740283006.

The spelling of 211468021 in words is "two hundred eleven million, four hundred sixty-eight thousand, twenty-one".