421451 has 4 divisors (see below), whose sum is σ = 422904. Its totient is φ = 420000.

The previous prime is 421433. The next prime is 421453. The reversal of 421451 is 154124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421451 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421453) 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, 125 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (105726).

2⁴²¹⁴⁵¹ is an apocalyptic number.

421451 is a deficient number, since it is larger than the sum of its proper divisors (1453).

421451 is a wasteful number, since it uses less digits than its factorization.

421451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452.

The product of its digits is 160, while the sum is 17.

The square root of 421451 is about 649.1925754351. The cubic root of 421451 is about 74.9748656519.

Adding to 421451 its reverse (154124), we get a palindrome (575575).

The spelling of 421451 in words is "four hundred twenty-one thousand, four hundred fifty-one".