2021172106 has 4 divisors (see below), whose sum is σ = 3031758162. Its totient is φ = 1010586052.

The previous prime is 2021172079. The next prime is 2021172151. The reversal of 2021172106 is 6012711202.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1065434881 + 955737225 = 32641^2 + 30915^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505293025 + ... + 505293028.

Almost surely, 2^2021172106 is an apocalyptic number.

2021172106 is a deficient number, since it is larger than the sum of its proper divisors (1010586056).

2021172106 is a wasteful number, since it uses less digits than its factorization.

2021172106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010586055.

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

The square root of 2021172106 is about 44957.4477255994. The cubic root of 2021172106 is about 1264.3513171329.

Adding to 2021172106 its reverse (6012711202), we get a palindrome (8033883308).

The spelling of 2021172106 in words is "two billion, twenty-one million, one hundred seventy-two thousand, one hundred six".