421401673 has 16 divisors (see below), whose sum is σ = 525833856. Its totient is φ = 328083840.

The previous prime is 421401667. The next prime is 421401679. The reversal of 421401673 is 376104124.

It is an interprime number because it is at equal distance from previous prime (421401667) and next prime (421401679).

It is not a de Polignac number, because 421401673 - 2¹⁷ = 421270601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421401679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169165 + ... + 171637.

It is an arithmetic number, because the mean of its divisors is an integer number (32864616).

Almost surely, 2^421401673 is an apocalyptic number.

It is an amenable number.

421401673 is a deficient number, since it is larger than the sum of its proper divisors (104432183).

421401673 is a wasteful number, since it uses less digits than its factorization.

421401673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 421401673 is about 20528.0703671826. The cubic root of 421401673 is about 749.7194049609.

Adding to 421401673 its reverse (376104124), we get a palindrome (797505797).

The spelling of 421401673 in words is "four hundred twenty-one million, four hundred one thousand, six hundred seventy-three".