216021735 has 80 divisors (see below), whose sum is σ = 414691200. Its totient is φ = 107262144.

The previous prime is 216021719. The next prime is 216021749. The reversal of 216021735 is 537120612.

It is a happy number.

216021735 is a `hidden beast` number, since 21 + 602 + 1 + 7 + 35 = 666.

It is not a de Polignac number, because 216021735 - 2⁴ = 216021719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 216021699 and 216021708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 515356 + ... + 515774.

It is an arithmetic number, because the mean of its divisors is an integer number (5183640).

Almost surely, 2^216021735 is an apocalyptic number.

216021735 is a deficient number, since it is larger than the sum of its proper divisors (198669465).

216021735 is a wasteful number, since it uses less digits than its factorization.

216021735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 216021735 is about 14697.6778778146. The cubic root of 216021735 is about 600.0201243250.

The spelling of 216021735 in words is "two hundred sixteen million, twenty-one thousand, seven hundred thirty-five".