1211223100231 has 4 divisors (see below), whose sum is σ = 1211372439264. Its totient is φ = 1211073761200.

The previous prime is 1211223100201. The next prime is 1211223100259. The reversal of 1211223100231 is 1320013221121.

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 1211223100231 - 2⁹ = 1211223099719 is a prime.

It is a super-2 number, since 2×1211223100231² (a number of 25 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 = 1211223100199 and 1211223100208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211223100201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74657350 + ... + 74673571.

It is an arithmetic number, because the mean of its divisors is an integer number (302843109816).

Almost surely, 2^{1211223100231} is an apocalyptic number.

1211223100231 is a deficient number, since it is larger than the sum of its proper divisors (149339033).

1211223100231 is an equidigital number, since it uses as much as digits as its factorization.

1211223100231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149339032.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1211223100231 its reverse (1320013221121), we get a palindrome (2531236321352).

The spelling of 1211223100231 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, one hundred thousand, two hundred thirty-one".