211212111223 has 4 divisors (see below), whose sum is σ = 211231241680. Its totient is φ = 211192980768.

The previous prime is 211212111217. The next prime is 211212111239. The reversal of 211212111223 is 322111212112.

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 211212111223 - 2¹³ = 211212103031 is a prime.

It is a super-2 number, since 2×211212111223² (a number of 23 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 211212111223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212111293) 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, 9548658 + ... + 9570751.

It is an arithmetic number, because the mean of its divisors is an integer number (52807810420).

Almost surely, 2^211212111223 is an apocalyptic number.

211212111223 is a deficient number, since it is larger than the sum of its proper divisors (19130457).

211212111223 is a wasteful number, since it uses less digits than its factorization.

211212111223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19130456.

The product of its digits is 96, while the sum is 19.

Adding to 211212111223 its reverse (322111212112), we get a palindrome (533323323335).

The spelling of 211212111223 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-three".