721512132 has 48 divisors (see below), whose sum is σ = 1844673600. Its totient is φ = 217676160.

The previous prime is 721512131. The next prime is 721512133. The reversal of 721512132 is 231215127.

It is an interprime number because it is at equal distance from previous prime (721512131) and next prime (721512133).

It is not an unprimeable number, because it can be changed into a prime (721512131) 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, 18294 + ... + 42162.

It is an arithmetic number, because the mean of its divisors is an integer number (38430700).

Almost surely, 2^721512132 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 721512132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922336800).

721512132 is an abundant number, since it is smaller than the sum of its proper divisors (1123161468).

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

721512132 is a wasteful number, since it uses less digits than its factorization.

721512132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24116 (or 24114 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 721512132 is about 26860.9778675312. The cubic root of 721512132 is about 896.9079620061.

Adding to 721512132 its reverse (231215127), we get a palindrome (952727259).

The spelling of 721512132 in words is "seven hundred twenty-one million, five hundred twelve thousand, one hundred thirty-two".