421215421 has 8 divisors (see below), whose sum is σ = 459684000. Its totient is φ = 382776240.

The previous prime is 421215413. The next prime is 421215449. The reversal of 421215421 is 124512124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421215421 - 2³ = 421215413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421215392 and 421215401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421215121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31630 + ... + 42928.

It is an arithmetic number, because the mean of its divisors is an integer number (57460500).

Almost surely, 2^421215421 is an apocalyptic number.

It is an amenable number.

421215421 is a deficient number, since it is larger than the sum of its proper divisors (38468579).

421215421 is a wasteful number, since it uses less digits than its factorization.

421215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14699.

The product of its digits is 640, while the sum is 22.

The square root of 421215421 is about 20523.5333458934. The cubic root of 421215421 is about 749.6089344962.

Adding to 421215421 its reverse (124512124), we get a palindrome (545727545).

The spelling of 421215421 in words is "four hundred twenty-one million, two hundred fifteen thousand, four hundred twenty-one".