15213221324 has 48 divisors (see below), whose sum is σ = 32338994688. Its totient is φ = 6113042688.

The previous prime is 15213221311. The next prime is 15213221327. The reversal of 15213221324 is 42312231251.

It is a junction number, because it is equal to n+sod(n) for n = 15213221293 and 15213221302.

It is not an unprimeable number, because it can be changed into a prime (15213221327) 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, 64427 + ... + 185949.

It is an arithmetic number, because the mean of its divisors is an integer number (673729056).

Almost surely, 2^15213221324 is an apocalyptic number.

15213221324 is a gapful number since it is divisible by the number (14) 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 15213221324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16169497344).

15213221324 is an abundant number, since it is smaller than the sum of its proper divisors (17125773364).

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

15213221324 is a wasteful number, since it uses less digits than its factorization.

15213221324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121814 (or 121812 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

Adding to 15213221324 its reverse (42312231251), we get a palindrome (57525452575).

The spelling of 15213221324 in words is "fifteen billion, two hundred thirteen million, two hundred twenty-one thousand, three hundred twenty-four".