212221563516 has 24 divisors (see below), whose sum is σ = 550204053840. Its totient is φ = 70740521136.

The previous prime is 212221563503. The next prime is 212221563539. The reversal of 212221563516 is 615365122212.

212221563516 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 1 + 5 + 635 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 982507131 + ... + 982507346.

It is an arithmetic number, because the mean of its divisors is an integer number (22925168910).

Almost surely, 2^212221563516 is an apocalyptic number.

It is an amenable number.

212221563516 is an abundant number, since it is smaller than the sum of its proper divisors (337982490324).

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

212221563516 is a wasteful number, since it uses less digits than its factorization.

212221563516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965014490 (or 1965014482 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

Adding to 212221563516 its reverse (615365122212), we get a palindrome (827586685728).

The spelling of 212221563516 in words is "two hundred twelve billion, two hundred twenty-one million, five hundred sixty-three thousand, five hundred sixteen".