421129128 has 48 divisors (see below), whose sum is σ = 1224715680. Its totient is φ = 120322272.

The previous prime is 421129127. The next prime is 421129133. The reversal of 421129128 is 821921124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 421129095 and 421129104.

It is not an unprimeable number, because it can be changed into a prime (421129123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177876 + ... + 180227.

It is an arithmetic number, because the mean of its divisors is an integer number (25514910).

Almost surely, 2^421129128 is an apocalyptic number.

It is an amenable number.

421129128 is an abundant number, since it is smaller than the sum of its proper divisors (803586552).

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

421129128 is a wasteful number, since it uses less digits than its factorization.

421129128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358126 (or 358115 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 421129128 is about 20521.4309442592. The cubic root of 421129128 is about 749.5577410384.

The spelling of 421129128 in words is "four hundred twenty-one million, one hundred twenty-nine thousand, one hundred twenty-eight".