212161518 has 20 divisors (see below), whose sum is σ = 475399320. Its totient is φ = 70720452.

The previous prime is 212161507. The next prime is 212161553. The reversal of 212161518 is 815161212.

212161518 is a `hidden beast` number, since 21 + 21 + 615 + 1 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212161491 and 212161500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 654658 + ... + 654981.

It is an arithmetic number, because the mean of its divisors is an integer number (23769966).

Almost surely, 2^212161518 is an apocalyptic number.

212161518 is an abundant number, since it is smaller than the sum of its proper divisors (263237802).

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

212161518 is a wasteful number, since it uses less digits than its factorization.

212161518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309653 (or 1309644 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 212161518 is about 14565.7652734074. The cubic root of 212161518 is about 596.4245863496.

The spelling of 212161518 in words is "two hundred twelve million, one hundred sixty-one thousand, five hundred eighteen".