1210011112221 has 32 divisors (see below), whose sum is σ = 1685895621120. Its totient is φ = 771175589184.

The previous prime is 1210011112217. The next prime is 1210011112259. The reversal of 1210011112221 is 1222111100121.

It is a happy number.

It is not a de Polignac number, because 1210011112221 - 2² = 1210011112217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210011112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210011112021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13071526 + ... + 13163768.

It is an arithmetic number, because the mean of its divisors is an integer number (52684238160).

Almost surely, 2^{1210011112221} is an apocalyptic number.

It is an amenable number.

1210011112221 is a deficient number, since it is larger than the sum of its proper divisors (475884508899).

1210011112221 is a wasteful number, since it uses less digits than its factorization.

1210011112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94345.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210011112221 its reverse (1222111100121), we get a palindrome (2432122212342).

The spelling of 1210011112221 in words is "one trillion, two hundred ten billion, eleven million, one hundred twelve thousand, two hundred twenty-one".