211012212212121 has 4 divisors (see below), whose sum is σ = 281349616282832. Its totient is φ = 140674808141412.

The previous prime is 211012212212063. The next prime is 211012212212177. The reversal of 211012212212121 is 121212212210112.

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 de Polignac number, because none of the positive numbers 2^k-211012212212121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211012212232121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35168702035351 + ... + 35168702035356.

It is an arithmetic number, because the mean of its divisors is an integer number (70337404070708).

Almost surely, 2^{211012212212121} is an apocalyptic number.

It is an amenable number.

211012212212121 is a deficient number, since it is larger than the sum of its proper divisors (70337404070711).

211012212212121 is an equidigital number, since it uses as much as digits as its factorization.

211012212212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70337404070710.

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

Adding to 211012212212121 its reverse (121212212210112), we get a palindrome (332224424422233).

The spelling of 211012212212121 in words is "two hundred eleven trillion, twelve billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".