221116938 has 64 divisors (see below), whose sum is σ = 525312000. Its totient is φ = 60709824.

The previous prime is 221116919. The next prime is 221116939. The reversal of 221116938 is 839611122.

It is a junction number, because it is equal to n+sod(n) for n = 221116899 and 221116908.

It is not an unprimeable number, because it can be changed into a prime (221116939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 461383 + ... + 461861.

It is an arithmetic number, because the mean of its divisors is an integer number (8208000).

Almost surely, 2^221116938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221116938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262656000).

221116938 is an abundant number, since it is smaller than the sum of its proper divisors (304195062).

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

221116938 is a wasteful number, since it uses less digits than its factorization.

221116938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899.

The product of its digits is 5184, while the sum is 33.

The square root of 221116938 is about 14870.0012777404. The cubic root of 221116938 is about 604.7009773826.

The spelling of 221116938 in words is "two hundred twenty-one million, one hundred sixteen thousand, nine hundred thirty-eight".