111210001221 has 64 divisors (see below), whose sum is σ = 172970588160. Its totient is φ = 62848800000.

The previous prime is 111210001213. The next prime is 111210001237. The reversal of 111210001221 is 122100012111.

It is not a de Polignac number, because 111210001221 - 2³ = 111210001213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210001197 and 111210001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210001291) 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 63 ways as a sum of consecutive naturals, for example, 10950496 + ... + 10960646.

It is an arithmetic number, because the mean of its divisors is an integer number (2702665440).

Almost surely, 2^111210001221 is an apocalyptic number.

111210001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111210001221 is a deficient number, since it is larger than the sum of its proper divisors (61760586939).

111210001221 is a wasteful number, since it uses less digits than its factorization.

111210001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458.

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

Adding to 111210001221 its reverse (122100012111), we get a palindrome (233310013332).

The spelling of 111210001221 in words is "one hundred eleven billion, two hundred ten million, one thousand, two hundred twenty-one".