1220111128 has 16 divisors (see below), whose sum is σ = 2343506760. Its totient is φ = 595176000.

The previous prime is 1220111119. The next prime is 1220111141. The reversal of 1220111128 is 8211110221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859598 + ... + 1860253.

Almost surely, 2^1220111128 is an apocalyptic number.

It is an amenable number.

1220111128 is a deficient number, since it is larger than the sum of its proper divisors (1123395632).

1220111128 is a wasteful number, since it uses less digits than its factorization.

1220111128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719898 (or 3719894 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1220111128 is about 34930.0891496143. The cubic root of 1220111128 is about 1068.5621727627.

Adding to 1220111128 its reverse (8211110221), we get a palindrome (9431221349).

The spelling of 1220111128 in words is "one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-eight".