421213240 has 64 divisors (see below), whose sum is σ = 1086336000. Its totient is φ = 143987328.

The previous prime is 421213193. The next prime is 421213241. The reversal of 421213240 is 42312124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421213241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100711 + ... + 104809.

It is an arithmetic number, because the mean of its divisors is an integer number (16974000).

Almost surely, 2^421213240 is an apocalyptic number.

421213240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421213240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543168000).

421213240 is an abundant number, since it is smaller than the sum of its proper divisors (665122760).

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

421213240 is a wasteful number, since it uses less digits than its factorization.

421213240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484 (or 4480 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 421213240 is about 20523.4802116990. The cubic root of 421213240 is about 749.6076407006.

Adding to 421213240 its reverse (42312124), we get a palindrome (463525364).

The spelling of 421213240 in words is "four hundred twenty-one million, two hundred thirteen thousand, two hundred forty".