212724810840 has 64 divisors (see below), whose sum is σ = 638260220160. Its totient is φ = 56718990720.

The previous prime is 212724810817. The next prime is 212724810847. The reversal of 212724810840 is 48018427212.

It is a Cunningham number, because it is equal to 461221²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212724810847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807135 + ... + 1037745.

It is an arithmetic number, because the mean of its divisors is an integer number (9972815940).

Almost surely, 2^212724810840 is an apocalyptic number.

212724810840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212724810840 is an abundant number, since it is smaller than the sum of its proper divisors (425535409320).

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

212724810840 is a wasteful number, since it uses less digits than its factorization.

212724810840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238312 (or 238308 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The spelling of 212724810840 in words is "two hundred twelve billion, seven hundred twenty-four million, eight hundred ten thousand, eight hundred forty".