211211020121111 has 8 divisors (see below), whose sum is σ = 223635848814144. Its totient is φ = 198786263765760.

The previous prime is 211211020120993. The next prime is 211211020121137. The reversal of 211211020121111 is 111121020112112.

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

It is not a de Polignac number, because 211211020121111 - 2⁴² = 206812973610007 is a prime.

It is a super-2 number, since 2×211211020121111² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211020121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211020121191) 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, 12014870 + ... + 23807123.

It is an arithmetic number, because the mean of its divisors is an integer number (27954481101768).

Almost surely, 2^{211211020121111} is an apocalyptic number.

211211020121111 is a deficient number, since it is larger than the sum of its proper divisors (12424828693033).

211211020121111 is a wasteful number, since it uses less digits than its factorization.

211211020121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36168841.

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

Adding to 211211020121111 its reverse (111121020112112), we get a palindrome (322332040233223).

The spelling of 211211020121111 in words is "two hundred eleven trillion, two hundred eleven billion, twenty million, one hundred twenty-one thousand, one hundred eleven".