1220511120 has 40 divisors (see below), whose sum is σ = 3783585216. Its totient is φ = 325469568.

The previous prime is 1220511091. The next prime is 1220511157. The reversal of 1220511120 is 211150221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1220511120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2542492 + ... + 2542971.

Almost surely, 2^1220511120 is an apocalyptic number.

1220511120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220511120 is an abundant number, since it is smaller than the sum of its proper divisors (2563074096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220511120 is a wasteful number, since it uses less digits than its factorization.

1220511120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085479 (or 5085473 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1220511120 is about 34935.8142884920. The cubic root of 1220511120 is about 1068.6789297838.

Adding to 1220511120 its reverse (211150221), we get a palindrome (1431661341).

The spelling of 1220511120 in words is "one billion, two hundred twenty million, five hundred eleven thousand, one hundred twenty".