221116829 has 4 divisors (see below), whose sum is σ = 221185980. Its totient is φ = 221047680.

The previous prime is 221116823. The next prime is 221116843. The reversal of 221116829 is 928611122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 928611122 = 2 ⋅464305561.

It can be written as a sum of positive squares in 2 ways, for example, as 150724729 + 70392100 = 12277^2 + 8390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221116829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221116795 and 221116804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221116823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29534 + ... + 36255.

It is an arithmetic number, because the mean of its divisors is an integer number (55296495).

Almost surely, 2^221116829 is an apocalyptic number.

It is an amenable number.

221116829 is a deficient number, since it is larger than the sum of its proper divisors (69151).

221116829 is an equidigital number, since it uses as much as digits as its factorization.

221116829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69150.

The product of its digits is 3456, while the sum is 32.

The square root of 221116829 is about 14869.9976126427. The cubic root of 221116829 is about 604.7008780197.

The spelling of 221116829 in words is "two hundred twenty-one million, one hundred sixteen thousand, eight hundred twenty-nine".