1110001221 has 48 divisors (see below), whose sum is σ = 1942739968. Its totient is φ = 597196800.

The previous prime is 1110001219. The next prime is 1110001237. The reversal of 1110001221 is 1221000111.

It is a happy number.

It is not a de Polignac number, because 1110001221 - 2¹ = 1110001219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

1110001221 is a modest number, since divided by 1221 gives 1110 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1110001421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64581 + ... + 79941.

Almost surely, 2^1110001221 is an apocalyptic number.

It is an amenable number.

1110001221 is a deficient number, since it is larger than the sum of its proper divisors (832738747).

1110001221 is a wasteful number, since it uses less digits than its factorization.

1110001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15442 (or 15439 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1110001221 is about 33316.6808220747. The cubic root of 1110001221 is about 1035.3991850945.

Adding to 1110001221 its reverse (1221000111), we get a palindrome (2331001332).

The spelling of 1110001221 in words is "one billion, one hundred ten million, one thousand, two hundred twenty-one".