212106005720 has 32 divisors (see below), whose sum is σ = 545415444000. Its totient is φ = 72722059008.

The previous prime is 212106005717. The next prime is 212106005729. The reversal of 212106005720 is 27500601212.

It is a super-3 number, since 3×212106005720³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212106005720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212106005729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378760445 + ... + 378761004.

It is an arithmetic number, because the mean of its divisors is an integer number (17044232625).

Almost surely, 2^212106005720 is an apocalyptic number.

212106005720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212106005720 is an abundant number, since it is smaller than the sum of its proper divisors (333309438280).

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

212106005720 is a wasteful number, since it uses less digits than its factorization.

212106005720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757521467 (or 757521463 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 212106005720 its reverse (27500601212), we get a palindrome (239606606932).

The spelling of 212106005720 in words is "two hundred twelve billion, one hundred six million, five thousand, seven hundred twenty".