421320540 has 48 divisors (see below), whose sum is σ = 1180704672. Its totient is φ = 112256256.

The previous prime is 421320539. The next prime is 421320541. The reversal of 421320540 is 45023124.

It is an interprime number because it is at equal distance from previous prime (421320539) and next prime (421320541).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421320541) 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, 93622 + ... + 98018.

It is an arithmetic number, because the mean of its divisors is an integer number (24598014).

Almost surely, 2^421320540 is an apocalyptic number.

It is an amenable number.

421320540 is an abundant number, since it is smaller than the sum of its proper divisors (759384132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421320540 is a wasteful number, since it uses less digits than its factorization.

421320540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006 (or 6004 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 421320540 is about 20526.0941243092. The cubic root of 421320540 is about 749.6712870626.

Adding to 421320540 its reverse (45023124), we get a palindrome (466343664).

It can be divided in two parts, 4213 and 20540, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 421320540 in words is "four hundred twenty-one million, three hundred twenty thousand, five hundred forty".