211112200012121 has 4 divisors (see below), whose sum is σ = 211168844019072. Its totient is φ = 211055556005172.

The previous prime is 211112200012019. The next prime is 211112200012127. The reversal of 211112200012121 is 121210002211112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211112200012121 is a prime.

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 211112200012121.

It is not an unprimeable number, because it can be changed into a prime (211112200012127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28321997885 + ... + 28322005338.

It is an arithmetic number, because the mean of its divisors is an integer number (52792211004768).

Almost surely, 2^{211112200012121} is an apocalyptic number.

It is an amenable number.

211112200012121 is a deficient number, since it is larger than the sum of its proper divisors (56644006951).

211112200012121 is an equidigital number, since it uses as much as digits as its factorization.

211112200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56644006950.

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

Adding to 211112200012121 its reverse (121210002211112), we get a palindrome (332322202223233).

The spelling of 211112200012121 in words is "two hundred eleven trillion, one hundred twelve billion, two hundred million, twelve thousand, one hundred twenty-one".