2106221207 has 4 divisors (see below), whose sum is σ = 2109269976. Its totient is φ = 2103172440.

The previous prime is 2106221203. The next prime is 2106221261. The reversal of 2106221207 is 7021226012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2106221207 - 2² = 2106221203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523348 + ... + 1524729.

It is an arithmetic number, because the mean of its divisors is an integer number (527317494).

Almost surely, 2^2106221207 is an apocalyptic number.

2106221207 is a deficient number, since it is larger than the sum of its proper divisors (3048769).

2106221207 is an equidigital number, since it uses as much as digits as its factorization.

2106221207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048768.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2106221207 is about 45893.5856847120. The cubic root of 2106221207 is about 1281.8424814761.

Adding to 2106221207 its reverse (7021226012), we get a palindrome (9127447219).

The spelling of 2106221207 in words is "two billion, one hundred six million, two hundred twenty-one thousand, two hundred seven".