211212516 has 12 divisors (see below), whose sum is σ = 492829232. Its totient is φ = 70404168.

The previous prime is 211212499. The next prime is 211212541. The reversal of 211212516 is 615212112.

211212516 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×211212516² = 89221453830100512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212492 and 211212501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8800510 + ... + 8800533.

Almost surely, 2^211212516 is an apocalyptic number.

It is an amenable number.

211212516 is an abundant number, since it is smaller than the sum of its proper divisors (281616716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211212516 is a wasteful number, since it uses less digits than its factorization.

211212516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17601050 (or 17601048 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 211212516 is about 14533.1523077411. The cubic root of 211212516 is about 595.5339847688.

Adding to 211212516 its reverse (615212112), we get a palindrome (826424628).

The spelling of 211212516 in words is "two hundred eleven million, two hundred twelve thousand, five hundred sixteen".