215223432144 has 160 divisors (see below), whose sum is σ = 672946452480. Its totient is φ = 57940793856.

The previous prime is 215223432131. The next prime is 215223432187. The reversal of 215223432144 is 441234322512.

It is a happy number.

It is a super-2 number, since 2×215223432144² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309942 + ... + 725610.

It is an arithmetic number, because the mean of its divisors is an integer number (4205915328).

Almost surely, 2^215223432144 is an apocalyptic number.

215223432144 is a gapful number since it is divisible by the number (24) 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 215223432144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336473226240).

215223432144 is an abundant number, since it is smaller than the sum of its proper divisors (457723020336).

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

215223432144 is a wasteful number, since it uses less digits than its factorization.

215223432144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415777 (or 415771 counting only the distinct ones).

The product of its digits is 46080, while the sum is 33.

Adding to 215223432144 its reverse (441234322512), we get a palindrome (656457754656).

The spelling of 215223432144 in words is "two hundred fifteen billion, two hundred twenty-three million, four hundred thirty-two thousand, one hundred forty-four".