211220321311 has 4 divisors (see below), whose sum is σ = 223645046112. Its totient is φ = 198795596512.

The previous prime is 211220321269. The next prime is 211220321357. The reversal of 211220321311 is 113123022112.

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 211220321311 - 2²³ = 211211932703 is a prime.

It is a super-2 number, since 2×211220321311² (a number of 23 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 (211220391311) 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, 6212362375 + ... + 6212362408.

It is an arithmetic number, because the mean of its divisors is an integer number (55911261528).

Almost surely, 2^211220321311 is an apocalyptic number.

211220321311 is a deficient number, since it is larger than the sum of its proper divisors (12424724801).

211220321311 is a wasteful number, since it uses less digits than its factorization.

211220321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424724800.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211220321311 its reverse (113123022112), we get a palindrome (324343343423).

The spelling of 211220321311 in words is "two hundred eleven billion, two hundred twenty million, three hundred twenty-one thousand, three hundred eleven".