211100012211221 has 8 divisors (see below), whose sum is σ = 241257308806080. Its totient is φ = 180942753614688.

The previous prime is 211100012211167. The next prime is 211100012211223. The reversal of 211100012211221 is 122112210001112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211100012211221 - 2¹⁸ = 211100011949077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211100012211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100012211223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3611450 + ... + 20862468.

It is an arithmetic number, because the mean of its divisors is an integer number (30157163600760).

Almost surely, 2^{211100012211221} is an apocalyptic number.

It is an amenable number.

211100012211221 is a deficient number, since it is larger than the sum of its proper divisors (30157296594859).

211100012211221 is a wasteful number, since it uses less digits than its factorization.

211100012211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18999163.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211100012211221 its reverse (122112210001112), we get a palindrome (333212222212333).

The spelling of 211100012211221 in words is "two hundred eleven trillion, one hundred billion, twelve million, two hundred eleven thousand, two hundred twenty-one".