11212120223231 has 4 divisors (see below), whose sum is σ = 11270214110592. Its totient is φ = 11154026335872.

The previous prime is 11212120223177. The next prime is 11212120223237. The reversal of 11212120223231 is 13232202121211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212120223231 is a prime.

It is a super-2 number, since 2×11212120223231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212120223197 and 11212120223206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212120223237) 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, 29046943391 + ... + 29046943776.

It is an arithmetic number, because the mean of its divisors is an integer number (2817553527648).

Almost surely, 2^{11212120223231} is an apocalyptic number.

11212120223231 is a deficient number, since it is larger than the sum of its proper divisors (58093887361).

11212120223231 is an equidigital number, since it uses as much as digits as its factorization.

11212120223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58093887360.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 11212120223231 its reverse (13232202121211), we get a palindrome (24444322344442).

The spelling of 11212120223231 in words is "eleven trillion, two hundred twelve billion, one hundred twenty million, two hundred twenty-three thousand, two hundred thirty-one".