1213123012211 has 16 divisors (see below), whose sum is σ = 1325949730560. Its totient is φ = 1100721763680.

The previous prime is 1213123012207. The next prime is 1213123012223. The reversal of 1213123012211 is 1122103213121.

It is not a de Polignac number, because 1213123012211 - 2² = 1213123012207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213123012201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14969960 + ... + 15050778.

It is an arithmetic number, because the mean of its divisors is an integer number (82871858160).

Almost surely, 2^{1213123012211} is an apocalyptic number.

1213123012211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213123012211 is a deficient number, since it is larger than the sum of its proper divisors (112826718349).

1213123012211 is a wasteful number, since it uses less digits than its factorization.

1213123012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83434.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1213123012211 its reverse (1122103213121), we get a palindrome (2335226225332).

The spelling of 1213123012211 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, twelve thousand, two hundred eleven".