216521146 has 16 divisors (see below), whose sum is σ = 348243840. Its totient is φ = 100601280.

The previous prime is 216521119. The next prime is 216521159. The reversal of 216521146 is 641125612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37620 + ... + 42991.

It is an arithmetic number, because the mean of its divisors is an integer number (21765240).

Almost surely, 2^216521146 is an apocalyptic number.

216521146 is a deficient number, since it is larger than the sum of its proper divisors (131722694).

216521146 is a wasteful number, since it uses less digits than its factorization.

216521146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80709.

The product of its digits is 2880, while the sum is 28.

The square root of 216521146 is about 14714.6575223483. The cubic root of 216521146 is about 600.4821550330.

Adding to 216521146 its reverse (641125612), we get a palindrome (857646758).

The spelling of 216521146 in words is "two hundred sixteen million, five hundred twenty-one thousand, one hundred forty-six".