116211221 has 4 divisors (see below), whose sum is σ = 132812832. Its totient is φ = 99609612.

The previous prime is 116211217. The next prime is 116211229. The reversal of 116211221 is 122112611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116211221 - 2² = 116211217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 116211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116211229) 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, 8300795 + ... + 8300808.

It is an arithmetic number, because the mean of its divisors is an integer number (33203208).

Almost surely, 2^116211221 is an apocalyptic number.

It is an amenable number.

116211221 is a deficient number, since it is larger than the sum of its proper divisors (16601611).

116211221 is an equidigital number, since it uses as much as digits as its factorization.

116211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16601610.

The product of its digits is 48, while the sum is 17.

The square root of 116211221 is about 10780.1308433618. The cubic root of 116211221 is about 487.9957294372.

Adding to 116211221 its reverse (122112611), we get a palindrome (238323832).

The spelling of 116211221 in words is "one hundred sixteen million, two hundred eleven thousand, two hundred twenty-one".