1213221210111 has 48 divisors (see below), whose sum is σ = 1830744115200. Its totient is φ = 802867528800.

The previous prime is 1213221210109. The next prime is 1213221210191. The reversal of 1213221210111 is 1110121223121.

It is a happy number.

1213221210111 is a `hidden beast` number, since 1 + 21 + 322 + 1 + 210 + 111 = 666.

It is not a de Polignac number, because 1213221210111 - 2¹ = 1213221210109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221210191) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18879886 + ... + 18944036.

It is an arithmetic number, because the mean of its divisors is an integer number (38140502400).

Almost surely, 2^{1213221210111} is an apocalyptic number.

1213221210111 is a deficient number, since it is larger than the sum of its proper divisors (617522905089).

1213221210111 is an equidigital number, since it uses as much as digits as its factorization.

1213221210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64738 (or 64726 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1213221210111 its reverse (1110121223121), we get a palindrome (2323342433232).

The spelling of 1213221210111 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".