421128100 has 18 divisors (see below), whose sum is σ = 913848194. Its totient is φ = 168451200.

The previous prime is 421128067. The next prime is 421128107. The reversal of 421128100 is 1821124.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 31539456 + 389588644 = 5616^2 + 19738^2 .

It is a super-2 number, since 2×421128100² = 354697753219220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421128107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2105541 + ... + 2105740.

Almost surely, 2^421128100 is an apocalyptic number.

It is an amenable number.

421128100 is an abundant number, since it is smaller than the sum of its proper divisors (492720094).

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

421128100 is a wasteful number, since it uses less digits than its factorization.

421128100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211295 (or 4211288 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 421128100 is about 20521.4058972576. The cubic root of 421128100 is about 749.5571311336.

Adding to 421128100 its reverse (1821124), we get a palindrome (422949224).

The spelling of 421128100 in words is "four hundred twenty-one million, one hundred twenty-eight thousand, one hundred".