127221128 has 16 divisors (see below), whose sum is σ = 238824780. Its totient is φ = 63534528.

The previous prime is 127221121. The next prime is 127221167. The reversal of 127221128 is 821122721.

It can be written as a sum of positive squares in 2 ways, for example, as 124590244 + 2630884 = 11162^2 + 1622^2 .

It is a junction number, because it is equal to n+sod(n) for n = 127221097 and 127221106.

It is not an unprimeable number, because it can be changed into a prime (127221121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051 + ... + 16082.

Almost surely, 2^127221128 is an apocalyptic number.

It is an amenable number.

127221128 is a deficient number, since it is larger than the sum of its proper divisors (111603652).

127221128 is a wasteful number, since it uses less digits than its factorization.

127221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19016 (or 19012 counting only the distinct ones).

The product of its digits is 896, while the sum is 26.

The square root of 127221128 is about 11279.2343711796. The cubic root of 127221128 is about 502.9441341225.

Adding to 127221128 its reverse (821122721), we get a palindrome (948343849).

The spelling of 127221128 in words is "one hundred twenty-seven million, two hundred twenty-one thousand, one hundred twenty-eight".