211212121121011 has 4 divisors (see below), whose sum is σ = 223636363539912. Its totient is φ = 198787878702112.

The previous prime is 211212121120993. The next prime is 211212121121039. The reversal of 211212121121011 is 110121121212112.

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

It is not a de Polignac number, because 211212121121011 - 2²³ = 211212112732403 is a prime.

It is a super-2 number, since 2×211212121121011² (a number of 29 digits) contains 22 as substring.

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 211212121121011.

It is not an unprimeable number, because it can be changed into a prime (211212121121311) 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, 6212121209425 + ... + 6212121209458.

It is an arithmetic number, because the mean of its divisors is an integer number (55909090884978).

Almost surely, 2^{211212121121011} is an apocalyptic number.

211212121121011 is a deficient number, since it is larger than the sum of its proper divisors (12424242418901).

211212121121011 is a wasteful number, since it uses less digits than its factorization.

211212121121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424242418900.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211212121121011 its reverse (110121121212112), we get a palindrome (321333242333123).

The spelling of 211212121121011 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, eleven".