221372838 has 160 divisors (see below), whose sum is σ = 564537600. Its totient is φ = 64494144.

The previous prime is 221372831. The next prime is 221372849. The reversal of 221372838 is 838273122.

It is a happy number.

221372838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (32256) is a multiple of the sum of its prime factors (168).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221372831) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3752053 + ... + 3752111.

It is an arithmetic number, because the mean of its divisors is an integer number (3528360).

Almost surely, 2^221372838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221372838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282268800).

221372838 is an abundant number, since it is smaller than the sum of its proper divisors (343164762).

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

221372838 is a wasteful number, since it uses less digits than its factorization.

221372838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 159 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 221372838 is about 14878.6033618751. The cubic root of 221372838 is about 604.9341621774.

The spelling of 221372838 in words is "two hundred twenty-one million, three hundred seventy-two thousand, eight hundred thirty-eight".