2121722 has 4 divisors (see below), whose sum is σ = 3182586. Its totient is φ = 1060860.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121722 is 2271212.

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., 1366561 + 755161 = 1169^2 + 869^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2121722.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530429 + ... + 530432.

2^2121722 is an apocalyptic number.

2121722 is a deficient number, since it is larger than the sum of its proper divisors (1060864).

2121722 is a wasteful number, since it uses less digits than its factorization.

2121722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060863.

The product of its digits is 112, while the sum is 17.

The square root of 2121722 is about 1456.6131950521. The cubic root of 2121722 is about 128.4979383662.

Adding to 2121722 its reverse (2271212), we get a palindrome (4392934).

The spelling of 2121722 in words is "two million, one hundred twenty-one thousand, seven hundred twenty-two".