212071561221 has 16 divisors (see below), whose sum is σ = 306314872640. Its totient is φ = 130505572080.

The previous prime is 212071561217. The next prime is 212071561237. The reversal of 212071561221 is 122165170212.

It is a happy number.

It is not a de Polignac number, because 212071561221 - 2² = 212071561217 is a prime.

It is a super-3 number, since 3×212071561221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212071561271) 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, 16081375 + ... + 16094556.

It is an arithmetic number, because the mean of its divisors is an integer number (19144679540).

Almost surely, 2^212071561221 is an apocalyptic number.

It is an amenable number.

212071561221 is a deficient number, since it is larger than the sum of its proper divisors (94243311419).

212071561221 is an equidigital number, since it uses as much as digits as its factorization.

212071561221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32175973 (or 32175947 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The spelling of 212071561221 in words is "two hundred twelve billion, seventy-one million, five hundred sixty-one thousand, two hundred twenty-one".