1220001111 has 48 divisors (see below), whose sum is σ = 2078562304. Its totient is φ = 674972352.

The previous prime is 1220001109. The next prime is 1220001131. The reversal of 1220001111 is 1111000221.

It is a happy number.

It is not a de Polignac number, because 1220001111 - 2¹ = 1220001109 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1220001093 and 1220001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220001131) 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 47 ways as a sum of consecutive naturals, for example, 518640 + ... + 520986.

Almost surely, 2^1220001111 is an apocalyptic number.

1220001111 is a deficient number, since it is larger than the sum of its proper divisors (858561193).

1220001111 is a wasteful number, since it uses less digits than its factorization.

1220001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620 (or 2617 counting only the distinct ones).

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

The square root of 1220001111 is about 34928.5142970611. The cubic root of 1220001111 is about 1068.5300545030.

Adding to 1220001111 its reverse (1111000221), we get a palindrome (2331001332).

The spelling of 1220001111 in words is "one billion, two hundred twenty million, one thousand, one hundred eleven".