11212021231 has 2 divisors, whose sum is σ = 11212021232. Its totient is φ = 11212021230.

The previous prime is 11212021217. The next prime is 11212021241. The reversal of 11212021231 is 13212021211.

It is a strong prime.

It is an emirp because it is prime and its reverse (13212021211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11212021231 - 2⁷ = 11212021103 is a prime.

It is a super-2 number, since 2×11212021231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212021241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606010615 + 5606010616.

It is an arithmetic number, because the mean of its divisors is an integer number (5606010616).

Almost surely, 2^11212021231 is an apocalyptic number.

11212021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212021231 is an equidigital number, since it uses as much as digits as its factorization.

11212021231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11212021231 its reverse (13212021211), we get a palindrome (24424042442).

The spelling of 11212021231 in words is "eleven billion, two hundred twelve million, twenty-one thousand, two hundred thirty-one".