211210022012021 has 4 divisors (see below), whose sum is σ = 211668178242444. Its totient is φ = 210751865781600.

The previous prime is 211210022012009. The next prime is 211210022012029. The reversal of 211210022012021 is 120210220012112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131248780180996 + 79961241831025 = 11456386^2 + 8942105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210022012021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210022012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229078114520 + ... + 229078115441.

It is an arithmetic number, because the mean of its divisors is an integer number (52917044560611).

Almost surely, 2^{211210022012021} is an apocalyptic number.

It is an amenable number.

211210022012021 is a deficient number, since it is larger than the sum of its proper divisors (458156230423).

211210022012021 is an equidigital number, since it uses as much as digits as its factorization.

211210022012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458156230422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211210022012021 its reverse (120210220012112), we get a palindrome (331420242024133).

The spelling of 211210022012021 in words is "two hundred eleven trillion, two hundred ten billion, twenty-two million, twelve thousand, twenty-one".