211212210020111 has 4 divisors (see below), whose sum is σ = 211410904480272. Its totient is φ = 211013515559952.

The previous prime is 211212210019963. The next prime is 211212210020153. The reversal of 211212210020111 is 111020012212112.

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

It is a cyclic number.

It is not a de Polignac number, because 211212210020111 - 2¹⁴ = 211212210003727 is a prime.

It is a super-2 number, since 2×211212210020111² (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 211212210020111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212210020171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99347228486 + ... + 99347230611.

It is an arithmetic number, because the mean of its divisors is an integer number (52852726120068).

Almost surely, 2^{211212210020111} is an apocalyptic number.

211212210020111 is a deficient number, since it is larger than the sum of its proper divisors (198694460161).

211212210020111 is a wasteful number, since it uses less digits than its factorization.

211212210020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198694460160.

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

Adding to 211212210020111 its reverse (111020012212112), we get a palindrome (322232222232223).

The spelling of 211212210020111 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred ten million, twenty thousand, one hundred eleven".