211121221111231 has 2 divisors, whose sum is σ = 211121221111232. Its totient is φ = 211121221111230.

The previous prime is 211121221111223. The next prime is 211121221111243. The reversal of 211121221111231 is 132111122121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121221111231 - 2³ = 211121221111223 is a prime.

It is a super-2 number, since 2×211121221111231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121221111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560610555615 + 105560610555616.

It is an arithmetic number, because the mean of its divisors is an integer number (105560610555616).

Almost surely, 2^{211121221111231} is an apocalyptic number.

211121221111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121221111231 is an equidigital number, since it uses as much as digits as its factorization.

211121221111231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 22.

Adding to 211121221111231 its reverse (132111122121112), we get a palindrome (343232343232343).

The spelling of 211121221111231 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".