421128811 has 16 divisors (see below), whose sum is σ = 455461920. Its totient is φ = 387924480.

The previous prime is 421128779. The next prime is 421128817. The reversal of 421128811 is 118821124.

It is a cyclic number.

It is not a de Polignac number, because 421128811 - 2⁵ = 421128779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421128811.

It is not an unprimeable number, because it can be changed into a prime (421128817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234505 + ... + 236293.

It is an arithmetic number, because the mean of its divisors is an integer number (28466370).

Almost surely, 2^421128811 is an apocalyptic number.

421128811 is a deficient number, since it is larger than the sum of its proper divisors (34333109).

421128811 is a wasteful number, since it uses less digits than its factorization.

421128811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094.

The product of its digits is 1024, while the sum is 28.

The square root of 421128811 is about 20521.4232206248. The cubic root of 421128811 is about 749.5575529647.

Adding to 421128811 its reverse (118821124), we get a palindrome (539949935).

It can be divided in two parts, 4211 and 28811, that multiplied together give a palindrome (121323121).

The spelling of 421128811 in words is "four hundred twenty-one million, one hundred twenty-eight thousand, eight hundred eleven".