2123216615 has 32 divisors (see below), whose sum is σ = 2909753280. Its totient is φ = 1473398784.

The previous prime is 2123216591. The next prime is 2123216639. The reversal of 2123216615 is 5166123212.

It is an interprime number because it is at equal distance from previous prime (2123216591) and next prime (2123216639).

It is a de Polignac number, because none of the positive numbers 2^k-2123216615 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1045421 + ... + 1047449.

It is an arithmetic number, because the mean of its divisors is an integer number (90929790).

Almost surely, 2^2123216615 is an apocalyptic number.

2123216615 is a deficient number, since it is larger than the sum of its proper divisors (786536665).

2123216615 is a wasteful number, since it uses less digits than its factorization.

2123216615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 4320, while the sum is 29.

The square root of 2123216615 is about 46078.3747000694. The cubic root of 2123216615 is about 1285.2810409432.

Adding to 2123216615 its reverse (5166123212), we get a palindrome (7289339827).

The spelling of 2123216615 in words is "two billion, one hundred twenty-three million, two hundred sixteen thousand, six hundred fifteen".