211221210111101 has 8 divisors (see below), whose sum is σ = 212914737282240. Its totient is φ = 209530167941952.

The previous prime is 211221210111097. The next prime is 211221210111143. The reversal of 211221210111101 is 101111012122112.

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 211221210111101 - 2² = 211221210111097 is a prime.

It is a super-2 number, since 2×211221210111101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211221210111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221210131101) 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, 621079820 + ... + 621419813.

It is an arithmetic number, because the mean of its divisors is an integer number (26614342160280).

Almost surely, 2^{211221210111101} is an apocalyptic number.

It is an amenable number.

211221210111101 is a deficient number, since it is larger than the sum of its proper divisors (1693527171139).

211221210111101 is a wasteful number, since it uses less digits than its factorization.

211221210111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242500995.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211221210111101 its reverse (101111012122112), we get a palindrome (312332222233213).

It can be divided in two parts, 21122121011 and 1101, that added together give a palindrome (21122122112).

The spelling of 211221210111101 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, one hundred one".