421340421 has 8 divisors (see below), whose sum is σ = 570172384. Its totient is φ = 276701040.

The previous prime is 421340411. The next prime is 421340431. The reversal of 421340421 is 124043124.

It is an interprime number because it is at equal distance from previous prime (421340411) and next prime (421340431).

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

It is not a de Polignac number, because 421340421 - 2⁵ = 421340389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421340411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047910 + ... + 1048311.

It is an arithmetic number, because the mean of its divisors is an integer number (71271548).

Almost surely, 2^421340421 is an apocalyptic number.

It is an amenable number.

421340421 is a deficient number, since it is larger than the sum of its proper divisors (148831963).

421340421 is a wasteful number, since it uses less digits than its factorization.

421340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096291.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 421340421 is about 20526.5784045953. The cubic root of 421340421 is about 749.6830785444.

Adding to 421340421 its reverse (124043124), we get a palindrome (545383545).

The spelling of 421340421 in words is "four hundred twenty-one million, three hundred forty thousand, four hundred twenty-one".