212551121 has 8 divisors (see below), whose sum is σ = 220521000. Its totient is φ = 204624000.

The previous prime is 212551111. The next prime is 212551127. The reversal of 212551121 is 121155212.

212551121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28569025 + 183982096 = 5345^2 + 13564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212551121 - 2⁶ = 212551057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212551093 and 212551102.

It is not an unprimeable number, because it can be changed into a prime (212551127) 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, 380 + ... + 20621.

It is an arithmetic number, because the mean of its divisors is an integer number (27565125).

Almost surely, 2^212551121 is an apocalyptic number.

It is an amenable number.

212551121 is a deficient number, since it is larger than the sum of its proper divisors (7969879).

212551121 is a wasteful number, since it uses less digits than its factorization.

212551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21379.

The product of its digits is 200, while the sum is 20.

The square root of 212551121 is about 14579.1330675044. The cubic root of 212551121 is about 596.7894447185.

The spelling of 212551121 in words is "two hundred twelve million, five hundred fifty-one thousand, one hundred twenty-one".