211212101222211 has 4 divisors (see below), whose sum is σ = 281616134962952. Its totient is φ = 140808067481472.

The previous prime is 211212101222153. The next prime is 211212101222231. The reversal of 211212101222211 is 112222101212112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 211212101222211 - 2⁹ = 211212101221699 is a prime.

It is a super-2 number, since 2×211212101222211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212101222231) 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, 35202016870366 + ... + 35202016870371.

It is an arithmetic number, because the mean of its divisors is an integer number (70404033740738).

Almost surely, 2^{211212101222211} is an apocalyptic number.

211212101222211 is a deficient number, since it is larger than the sum of its proper divisors (70404033740741).

211212101222211 is an equidigital number, since it uses as much as digits as its factorization.

211212101222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70404033740740.

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

Adding to 211212101222211 its reverse (112222101212112), we get a palindrome (323434202434323).

The spelling of 211212101222211 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred one million, two hundred twenty-two thousand, two hundred eleven".