11211121121231 has 2 divisors, whose sum is σ = 11211121121232. Its totient is φ = 11211121121230.

The previous prime is 11211121121173. The next prime is 11211121121279. The reversal of 11211121121231 is 13212112111211.

It is a m-pointer prime, because the next prime (11211121121279) can be obtained adding 11211121121231 to its product of digits (48).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11211121121231 - 2¹⁰ = 11211121120207 is a prime.

It is a super-2 number, since 2×11211121121231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211121123231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605560560615 + 5605560560616.

It is an arithmetic number, because the mean of its divisors is an integer number (5605560560616).

Almost surely, 2^{11211121121231} is an apocalyptic number.

11211121121231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211121121231 is an equidigital number, since it uses as much as digits as its factorization.

11211121121231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 20.

Adding to 11211121121231 its reverse (13212112111211), we get a palindrome (24423233232442).

The spelling of 11211121121231 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-one".