216213515 has 16 divisors (see below), whose sum is σ = 297805248. Its totient is φ = 147618816.

The previous prime is 216213467. The next prime is 216213577. The reversal of 216213515 is 515312612.

It is a cyclic number.

It is not a de Polignac number, because 216213515 - 2⁶ = 216213451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5102 + ... + 21411.

It is an arithmetic number, because the mean of its divisors is an integer number (18612828).

Almost surely, 2^216213515 is an apocalyptic number.

216213515 is a deficient number, since it is larger than the sum of its proper divisors (81591733).

216213515 is a wasteful number, since it uses less digits than its factorization.

216213515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26758.

The product of its digits is 1800, while the sum is 26.

The square root of 216213515 is about 14704.2005903075. The cubic root of 216213515 is about 600.1976339683.

The spelling of 216213515 in words is "two hundred sixteen million, two hundred thirteen thousand, five hundred fifteen".