1210111222221 has 48 divisors (see below), whose sum is σ = 1951820462592. Its totient is φ = 716112381600.

The previous prime is 1210111222189. The next prime is 1210111222237. The reversal of 1210111222221 is 1222221110121.

1210111222221 is a `hidden beast` number, since 1 + 210 + 1 + 11 + 222 + 221 = 666.

It is not a de Polignac number, because 1210111222221 - 2⁵ = 1210111222189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210111222194 and 1210111222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111222261) 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, 13539546 + ... + 13628628.

It is an arithmetic number, because the mean of its divisors is an integer number (40662926304).

Almost surely, 2^{1210111222221} is an apocalyptic number.

1210111222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210111222221 is a deficient number, since it is larger than the sum of its proper divisors (741709240371).

1210111222221 is a wasteful number, since it uses less digits than its factorization.

1210111222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92334 (or 92331 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1210111222221 its reverse (1222221110121), we get a palindrome (2432332332342).

The spelling of 1210111222221 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".