2121716 has 6 divisors (see below), whose sum is σ = 3713010. Its totient is φ = 1060856.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121716 is 6171212.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 729316 = 1180^2 + 854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265211 + ... + 265218.

It is an arithmetic number, because the mean of its divisors is an integer number (618835).

2^2121716 is an apocalyptic number.

It is an amenable number.

2121716 is a deficient number, since it is larger than the sum of its proper divisors (1591294).

2121716 is a wasteful number, since it uses less digits than its factorization.

2121716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530433 (or 530431 counting only the distinct ones).

The product of its digits is 168, while the sum is 20.

The square root of 2121716 is about 1456.6111354785. The cubic root of 2121716 is about 128.4978172400.

Adding to 2121716 its reverse (6171212), we get a palindrome (8292928).

The spelling of 2121716 in words is "two million, one hundred twenty-one thousand, seven hundred sixteen".