212018540 has 24 divisors (see below), whose sum is σ = 445571280. Its totient is φ = 84744128.

The previous prime is 212018489. The next prime is 212018557. The reversal of 212018540 is 45810212.

It is a super-2 number, since 2×212018540² = 89903722607463200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31079 + ... + 37281.

It is an arithmetic number, because the mean of its divisors is an integer number (18565470).

Almost surely, 2^212018540 is an apocalyptic number.

212018540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212018540 is an abundant number, since it is smaller than the sum of its proper divisors (233552740).

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

212018540 is a wasteful number, since it uses less digits than its factorization.

212018540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921 (or 7919 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 212018540 is about 14560.8564308560. The cubic root of 212018540 is about 596.2905771939.

Adding to 212018540 its reverse (45810212), we get a palindrome (257828752).

The spelling of 212018540 in words is "two hundred twelve million, eighteen thousand, five hundred forty".