15211432240 has 80 divisors (see below), whose sum is σ = 35870739840. Its totient is φ = 5998361600.

The previous prime is 15211432213. The next prime is 15211432259. The reversal of 15211432240 is 4223411251.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×15211432240² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 1927182 + ... + 1935058.

It is an arithmetic number, because the mean of its divisors is an integer number (448384248).

Almost surely, 2^15211432240 is an apocalyptic number.

15211432240 is a gapful number since it is divisible by the number (10) 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 15211432240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17935369920).

15211432240 is an abundant number, since it is smaller than the sum of its proper divisors (20659307600).

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

15211432240 is a wasteful number, since it uses less digits than its factorization.

15211432240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8230 (or 8224 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 15211432240 its reverse (4223411251), we get a palindrome (19434843491).

The spelling of 15211432240 in words is "fifteen billion, two hundred eleven million, four hundred thirty-two thousand, two hundred forty".