221434323400 has 96 divisors (see below), whose sum is σ = 520941657600. Its totient is φ = 87526771200.

The previous prime is 221434323389. The next prime is 221434323431. The reversal of 221434323400 is 4323434122.

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 23 ways as a sum of consecutive naturals, for example, 9856180 + ... + 9878620.

It is an arithmetic number, because the mean of its divisors is an integer number (5426475600).

Almost surely, 2^221434323400 is an apocalyptic number.

221434323400 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 221434323400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260470828800).

221434323400 is an abundant number, since it is smaller than the sum of its proper divisors (299507334200).

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

221434323400 is a wasteful number, since it uses less digits than its factorization.

221434323400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23039 (or 23030 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 221434323400 its reverse (4323434122), we get a palindrome (225757757522).

The spelling of 221434323400 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred twenty-three thousand, four hundred".