421169421 has 4 divisors (see below), whose sum is σ = 561559232. Its totient is φ = 280779612.

The previous prime is 421169417. The next prime is 421169459. The reversal of 421169421 is 124961124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 421169421 - 2² = 421169417 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 (421169521) 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, 70194901 + ... + 70194906.

It is an arithmetic number, because the mean of its divisors is an integer number (140389808).

Almost surely, 2^421169421 is an apocalyptic number.

It is an amenable number.

421169421 is a deficient number, since it is larger than the sum of its proper divisors (140389811).

421169421 is a wasteful number, since it uses less digits than its factorization.

421169421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140389810.

The product of its digits is 3456, while the sum is 30.

The square root of 421169421 is about 20522.4126505633. The cubic root of 421169421 is about 749.5816457942.

The spelling of 421169421 in words is "four hundred twenty-one million, one hundred sixty-nine thousand, four hundred twenty-one".