216631010 has 8 divisors (see below), whose sum is σ = 389935836. Its totient is φ = 86652400.

The previous prime is 216631001. The next prime is 216631013. The reversal of 216631010 is 10136612.

216631010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 176650681 + 39980329 = 13291^2 + 6323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216631013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10831541 + ... + 10831560.

Almost surely, 2^216631010 is an apocalyptic number.

216631010 is a deficient number, since it is larger than the sum of its proper divisors (173304826).

216631010 is a wasteful number, since it uses less digits than its factorization.

216631010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21663108.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 216631010 is about 14718.3901973008. The cubic root of 216631010 is about 600.5837004906.

Adding to 216631010 its reverse (10136612), we get a palindrome (226767622).

The spelling of 216631010 in words is "two hundred sixteen million, six hundred thirty-one thousand, ten".