1321616724 has 12 divisors (see below), whose sum is σ = 3083772384. Its totient is φ = 440538904.

The previous prime is 1321616717. The next prime is 1321616729. The reversal of 1321616724 is 4276161231.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321616729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55067352 + ... + 55067375.

It is an arithmetic number, because the mean of its divisors is an integer number (256981032).

Almost surely, 2^1321616724 is an apocalyptic number.

It is an amenable number.

1321616724 is an abundant number, since it is smaller than the sum of its proper divisors (1762155660).

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

1321616724 is a wasteful number, since it uses less digits than its factorization.

1321616724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110134734 (or 110134732 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 1321616724 is about 36354.0468723910. The cubic root of 1321616724 is about 1097.4089771838.

Adding to 1321616724 its reverse (4276161231), we get a palindrome (5597777955).

The spelling of 1321616724 in words is "one billion, three hundred twenty-one million, six hundred sixteen thousand, seven hundred twenty-four".