215254321100 has 144 divisors (see below), whose sum is σ = 575191685376. Its totient is φ = 68089248000.

The previous prime is 215254321099. The next prime is 215254321109. The reversal of 215254321100 is 1123452512.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 215254321100.

It is not an unprimeable number, because it can be changed into a prime (215254321109) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 21935195 + ... + 21945005.

It is an arithmetic number, because the mean of its divisors is an integer number (3994386704).

Almost surely, 2^215254321100 is an apocalyptic number.

215254321100 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 215254321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287595842688).

215254321100 is an abundant number, since it is smaller than the sum of its proper divisors (359937364276).

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

215254321100 is a wasteful number, since it uses less digits than its factorization.

215254321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12256 (or 12249 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 215254321100 its reverse (1123452512), we get a palindrome (216377773612).

The spelling of 215254321100 in words is "two hundred fifteen billion, two hundred fifty-four million, three hundred twenty-one thousand, one hundred".