421321516 has 72 divisors (see below), whose sum is σ = 951526688. Its totient is φ = 159667200.

The previous prime is 421321513. The next prime is 421321531. The reversal of 421321516 is 615123124.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (421321513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123676 + ... + 127036.

Almost surely, 2^421321516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421321516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475763344).

421321516 is an abundant number, since it is smaller than the sum of its proper divisors (530205172).

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

421321516 is a wasteful number, since it uses less digits than its factorization.

421321516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3431 (or 3418 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 421321516 is about 20526.1178989111. The cubic root of 421321516 is about 749.6718659398.

The spelling of 421321516 in words is "four hundred twenty-one million, three hundred twenty-one thousand, five hundred sixteen".