211110212212221 has 8 divisors (see below), whose sum is σ = 321691751942464. Its totient is φ = 120634406978400.

The previous prime is 211110212212219. The next prime is 211110212212241. The reversal of 211110212212221 is 122212212011112.

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

It is not a de Polignac number, because 211110212212221 - 2¹ = 211110212212219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10052867248201 = 211110212212221 / (2 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 2 + 2 + 1 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110212212241) 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, 5026433624080 + ... + 5026433624121.

It is an arithmetic number, because the mean of its divisors is an integer number (40211468992808).

Almost surely, 2^{211110212212221} is an apocalyptic number.

211110212212221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211110212212221 is a deficient number, since it is larger than the sum of its proper divisors (110581539730243).

211110212212221 is a wasteful number, since it uses less digits than its factorization.

211110212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052867248211.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211110212212221 its reverse (122212212011112), we get a palindrome (333322424223333).

The spelling of 211110212212221 in words is "two hundred eleven trillion, one hundred ten billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".