1210110001221 has 24 divisors (see below), whose sum is σ = 1830704065792. Its totient is φ = 709741929600.

The previous prime is 1210110001213. The next prime is 1210110001249. The reversal of 1210110001221 is 1221000110121.

It is not a de Polignac number, because 1210110001221 - 2³ = 1210110001213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210110001197 and 1210110001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210110001211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53757076 + ... + 53779581.

Almost surely, 2^{1210110001221} is an apocalyptic number.

1210110001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210110001221 is a deficient number, since it is larger than the sum of its proper divisors (620594064571).

1210110001221 is a wasteful number, since it uses less digits than its factorization.

1210110001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107536713 (or 107536702 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1210110001221 its reverse (1221000110121), we get a palindrome (2431110111342).

The spelling of 1210110001221 in words is "one trillion, two hundred ten billion, one hundred ten million, one thousand, two hundred twenty-one".