212005721560 has 32 divisors (see below), whose sum is σ = 478710453600. Its totient is φ = 84500496640.

The previous prime is 212005721539. The next prime is 212005721621. The reversal of 212005721560 is 65127500212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9419620 + ... + 9442099.

It is an arithmetic number, because the mean of its divisors is an integer number (14959701675).

Almost surely, 2^212005721560 is an apocalyptic number.

212005721560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212005721560 is an abundant number, since it is smaller than the sum of its proper divisors (266704732040).

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

212005721560 is a wasteful number, since it uses less digits than its factorization.

212005721560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18862011 (or 18862007 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 212005721560 in words is "two hundred twelve billion, five million, seven hundred twenty-one thousand, five hundred sixty".