421951 has 4 divisors (see below), whose sum is σ = 425304. Its totient is φ = 418600.

The previous prime is 421943. The next prime is 421973. The reversal of 421951 is 159124.

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

It is a cyclic number.

It is not a de Polignac number, because 421951 - 2³ = 421943 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480 + ... + 1741.

It is an arithmetic number, because the mean of its divisors is an integer number (106326).

2⁴²¹⁹⁵¹ is an apocalyptic number.

421951 is the 291-st centered decagonal number.

421951 is a deficient number, since it is larger than the sum of its proper divisors (3353).

421951 is a wasteful number, since it uses less digits than its factorization.

421951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352.

The product of its digits is 360, while the sum is 22.

The square root of 421951 is about 649.5775550310. The cubic root of 421951 is about 75.0045034333.

The spelling of 421951 in words is "four hundred twenty-one thousand, nine hundred fifty-one".