212531516 has 12 divisors (see below), whose sum is σ = 372229032. Its totient is φ = 106180368.

The previous prime is 212531513. The next prime is 212531521. The reversal of 212531516 is 615135212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212531513) 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, 15575 + ... + 25838.

It is an arithmetic number, because the mean of its divisors is an integer number (31019086).

Almost surely, 2^212531516 is an apocalyptic number.

It is an amenable number.

212531516 is a deficient number, since it is larger than the sum of its proper divisors (159697516).

212531516 is a wasteful number, since it uses less digits than its factorization.

212531516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42700 (or 42698 counting only the distinct ones).

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

The square root of 212531516 is about 14578.4606869175. The cubic root of 212531516 is about 596.7710955377.

Adding to 212531516 its reverse (615135212), we get a palindrome (827666728).

The spelling of 212531516 in words is "two hundred twelve million, five hundred thirty-one thousand, five hundred sixteen".