2106221345 has 16 divisors (see below), whose sum is σ = 2662789440. Its totient is φ = 1594914624.

The previous prime is 2106221339. The next prime is 2106221347. The reversal of 2106221345 is 5431226012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2106221345 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2106221347) 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, 108554 + ... + 126476.

It is an arithmetic number, because the mean of its divisors is an integer number (166424340).

Almost surely, 2^2106221345 is an apocalyptic number.

It is an amenable number.

2106221345 is a deficient number, since it is larger than the sum of its proper divisors (556568095).

2106221345 is a wasteful number, since it uses less digits than its factorization.

2106221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19184.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2106221345 is about 45893.5871881900. The cubic root of 2106221345 is about 1281.8425094716.

Adding to 2106221345 its reverse (5431226012), we get a palindrome (7537447357).

The spelling of 2106221345 in words is "two billion, one hundred six million, two hundred twenty-one thousand, three hundred forty-five".