2123216 has 10 divisors (see below), whose sum is σ = 4113762. Its totient is φ = 1061600.

The previous prime is 2123213. The next prime is 2123237. The reversal of 2123216 is 6123212.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 163216 = 1400^2 + 404^2 .

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2123194 and 2123203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66335 + ... + 66366.

2^2123216 is an apocalyptic number.

It is an amenable number.

2123216 is a deficient number, since it is larger than the sum of its proper divisors (1990546).

2123216 is a wasteful number, since it uses less digits than its factorization.

2123216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132709 (or 132703 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 2123216 is about 1457.1259382771. The cubic root of 2123216 is about 128.5280916847.

Adding to 2123216 its reverse (6123212), we get a palindrome (8246428).

The spelling of 2123216 in words is "two million, one hundred twenty-three thousand, two hundred sixteen".