221143398 has 48 divisors (see below), whose sum is σ = 522397440. Its totient is φ = 61134480.

The previous prime is 221143393. The next prime is 221143399. The reversal of 221143398 is 893341122.

221143398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221143393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37623 + ... + 43101.

It is an arithmetic number, because the mean of its divisors is an integer number (10883280).

Almost surely, 2^221143398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221143398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261198720).

221143398 is an abundant number, since it is smaller than the sum of its proper divisors (301254042).

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

221143398 is a wasteful number, since it uses less digits than its factorization.

221143398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553 (or 5522 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 221143398 is about 14870.8909618758. The cubic root of 221143398 is about 604.7250969726.

The spelling of 221143398 in words is "two hundred twenty-one million, one hundred forty-three thousand, three hundred ninety-eight".