212631616 has 14 divisors (see below), whose sum is σ = 421940990. Its totient is φ = 106315776.

The previous prime is 212631607. The next prime is 212631647. The reversal of 212631616 is 616136212.

212631616 is digitally balanced in base 3, 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 only one way, i.e., 207360000 + 5271616 = 14400^2 + 2296^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661121 + ... + 1661248.

Almost surely, 2^212631616 is an apocalyptic number.

It is an amenable number.

212631616 is a deficient number, since it is larger than the sum of its proper divisors (209309374).

212631616 is an equidigital number, since it uses as much as digits as its factorization.

212631616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322381 (or 3322371 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 212631616 is about 14581.8934298671. The cubic root of 212631616 is about 596.8647717005.

Adding to 212631616 its reverse (616136212), we get a palindrome (828767828).

The spelling of 212631616 in words is "two hundred twelve million, six hundred thirty-one thousand, six hundred sixteen".