2106221650 has 36 divisors (see below), whose sum is σ = 4242121902. Its totient is φ = 777678720.

The previous prime is 2106221609. The next prime is 2106221651. The reversal of 2106221650 is 561226012.

It can be written as a sum of positive squares in 9 ways, for example, as 101062809 + 2005158841 = 10053^2 + 44779^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (2106221651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 116179 + ... + 133078.

Almost surely, 2^2106221650 is an apocalyptic number.

2106221650 is an abundant number, since it is smaller than the sum of its proper divisors (2135900252).

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

2106221650 is a wasteful number, since it uses less digits than its factorization.

2106221650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249295 (or 249277 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2106221650 is about 45893.5905110942. The cubic root of 2106221650 is about 1281.8425713458.

Adding to 2106221650 its reverse (561226012), we get a palindrome (2667447662).

The spelling of 2106221650 in words is "two billion, one hundred six million, two hundred twenty-one thousand, six hundred fifty".