421881 has 4 divisors (see below), whose sum is σ = 562512. Its totient is φ = 281252.

The previous prime is 421847. The next prime is 421891. The reversal of 421881 is 188124.

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 a cyclic number.

It is not a de Polignac number, because 421881 - 2¹⁰ = 420857 is a prime.

It is a super-2 number, since 2×421881² = 355967156322, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421801) 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, 70311 + ... + 70316.

It is an arithmetic number, because the mean of its divisors is an integer number (140628).

2⁴²¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

421881 is a deficient number, since it is larger than the sum of its proper divisors (140631).

421881 is a wasteful number, since it uses less digits than its factorization.

421881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140630.

The product of its digits is 512, while the sum is 24.

The square root of 421881 is about 649.5236716241. The cubic root of 421881 is about 75.0003555539. Note that the first 3 decimals are identical.

The spelling of 421881 in words is "four hundred twenty-one thousand, eight hundred eighty-one".