421005911 has 4 divisors (see below), whose sum is σ = 421048512. Its totient is φ = 420963312.

The previous prime is 421005881. The next prime is 421005913. The reversal of 421005911 is 119500124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421005911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421005913) 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, 2075 + ... + 29091.

It is an arithmetic number, because the mean of its divisors is an integer number (105262128).

Almost surely, 2^421005911 is an apocalyptic number.

421005911 is a deficient number, since it is larger than the sum of its proper divisors (42601).

421005911 is a wasteful number, since it uses less digits than its factorization.

421005911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42600.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 421005911 is about 20518.4285704339. The cubic root of 421005911 is about 749.4846302361.

The spelling of 421005911 in words is "four hundred twenty-one million, five thousand, nine hundred eleven".