211221121013211 has 16 divisors (see below), whose sum is σ = 289250635980800. Its totient is φ = 137003130273888.

The previous prime is 211221121013209. The next prime is 211221121013249. The reversal of 211221121013211 is 112310121122112.

It is not a de Polignac number, because 211221121013211 - 2¹ = 211221121013209 is a prime.

It is a super-2 number, since 2×211221121013211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221121013261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32905051 + ... + 38796708.

It is an arithmetic number, because the mean of its divisors is an integer number (18078164748800).

Almost surely, 2^{211221121013211} is an apocalyptic number.

211221121013211 is a deficient number, since it is larger than the sum of its proper divisors (78029514967589).

211221121013211 is a wasteful number, since it uses less digits than its factorization.

211221121013211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71728338.

The product of its (nonzero) digits is 96, while the sum is 21.

Adding to 211221121013211 its reverse (112310121122112), we get a palindrome (323531242135323).

The spelling of 211221121013211 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, thirteen thousand, two hundred eleven".