211212110021311 has 4 divisors (see below), whose sum is σ = 241385268595792. Its totient is φ = 181038951446832.

The previous prime is 211212110021281. The next prime is 211212110021317. The reversal of 211212110021311 is 113120011212112.

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 211212110021311 - 2²³ = 211212101632703 is a prime.

It is a super-2 number, since 2×211212110021311² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212110021317) 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, 15086579287230 + ... + 15086579287243.

It is an arithmetic number, because the mean of its divisors is an integer number (60346317148948).

Almost surely, 2^{211212110021311} is an apocalyptic number.

211212110021311 is a deficient number, since it is larger than the sum of its proper divisors (30173158574481).

211212110021311 is an equidigital number, since it uses as much as digits as its factorization.

211212110021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30173158574480.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 211212110021311 its reverse (113120011212112), we get a palindrome (324332121233423).

The spelling of 211212110021311 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred ten million, twenty-one thousand, three hundred eleven".