421128677 has 4 divisors (see below), whose sum is σ = 422211660. Its totient is φ = 420045696.

The previous prime is 421128661. The next prime is 421128679. The reversal of 421128677 is 776821124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39551521 + 381577156 = 6289^2 + 19534^2 .

It is a cyclic number.

It is not a de Polignac number, because 421128677 - 2⁴ = 421128661 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 421128677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421128679) 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, 540908 + ... + 541685.

It is an arithmetic number, because the mean of its divisors is an integer number (105552915).

Almost surely, 2^421128677 is an apocalyptic number.

It is an amenable number.

421128677 is a deficient number, since it is larger than the sum of its proper divisors (1082983).

421128677 is a wasteful number, since it uses less digits than its factorization.

421128677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082982.

The product of its digits is 37632, while the sum is 38.

The square root of 421128677 is about 20521.4199557438. The cubic root of 421128677 is about 749.5574734636.

The spelling of 421128677 in words is "four hundred twenty-one million, one hundred twenty-eight thousand, six hundred seventy-seven".