215432100400 has 480 divisors, whose sum is σ = 615044920320. Its totient is φ = 71663616000.

The previous prime is 215432100353. The next prime is 215432100407. The reversal of 215432100400 is 4001234512.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (215432100407) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 794952265 + ... + 794952535.

It is an arithmetic number, because the mean of its divisors is an integer number (1281343584).

Almost surely, 2^215432100400 is an apocalyptic number.

215432100400 is a gapful number since it is divisible by the number (20) 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 215432100400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307522460160).

215432100400 is an abundant number, since it is smaller than the sum of its proper divisors (399612819920).

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

215432100400 is a wasteful number, since it uses less digits than its factorization.

215432100400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 215432100400 its reverse (4001234512), we get a palindrome (219433334912).

The spelling of 215432100400 in words is "two hundred fifteen billion, four hundred thirty-two million, one hundred thousand, four hundred".