116721220 has 48 divisors (see below), whose sum is σ = 305601408. Its totient is φ = 36380160.

The previous prime is 116721151. The next prime is 116721229. The reversal of 116721220 is 22127611.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 116721191 and 116721200.

It is not an unprimeable number, because it can be changed into a prime (116721229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36357 + ... + 39436.

It is an arithmetic number, because the mean of its divisors is an integer number (6366696).

Almost surely, 2^116721220 is an apocalyptic number.

116721220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

116721220 is an abundant number, since it is smaller than the sum of its proper divisors (188880188).

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

116721220 is a wasteful number, since it uses less digits than its factorization.

116721220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75820 (or 75818 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 116721220 is about 10803.7595308300. The cubic root of 116721220 is about 488.7085525953.

Adding to 116721220 its reverse (22127611), we get a palindrome (138848831).

The spelling of 116721220 in words is "one hundred sixteen million, seven hundred twenty-one thousand, two hundred twenty".