211021110021211 has 6 divisors (see below), whose sum is σ = 245473536147180. Its totient is φ = 180875237160996.

The previous prime is 211021110021191. The next prime is 211021110021251. The reversal of 211021110021211 is 112120011120112.

It is a de Polignac number, because none of the positive numbers 2^k-211021110021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211021110021251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2153276632821 + ... + 2153276632918.

It is an arithmetic number, because the mean of its divisors is an integer number (40912256024530).

Almost surely, 2^{211021110021211} is an apocalyptic number.

211021110021211 is a deficient number, since it is larger than the sum of its proper divisors (34452426125969).

211021110021211 is an equidigital number, since it uses as much as digits as its factorization.

211021110021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306553265753 (or 4306553265746 counting only the distinct ones).

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

Adding to 211021110021211 its reverse (112120011120112), we get a palindrome (323141121141323).

The spelling of 211021110021211 in words is "two hundred eleven trillion, twenty-one billion, one hundred ten million, twenty-one thousand, two hundred eleven".