212261321 has 4 divisors (see below), whose sum is σ = 212290500. Its totient is φ = 212232144.

The previous prime is 212261311. The next prime is 212261327. The reversal of 212261321 is 123162212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 50055625 + 162205696 = 7075^2 + 12736^2 .

It is a cyclic number.

It is not a de Polignac number, because 212261321 - 2¹⁴ = 212244937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212261293 and 212261302.

It is not an unprimeable number, because it can be changed into a prime (212261327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6155 + ... + 21503.

It is an arithmetic number, because the mean of its divisors is an integer number (53072625).

Almost surely, 2^212261321 is an apocalyptic number.

It is an amenable number.

212261321 is a deficient number, since it is larger than the sum of its proper divisors (29179).

212261321 is a wasteful number, since it uses less digits than its factorization.

212261321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29178.

The product of its digits is 288, while the sum is 20.

The square root of 212261321 is about 14569.1908148668. The cubic root of 212261321 is about 596.5180931462.

The spelling of 212261321 in words is "two hundred twelve million, two hundred sixty-one thousand, three hundred twenty-one".