212432221 has 8 divisors (see below), whose sum is σ = 232684920. Its totient is φ = 193041408.

The previous prime is 212432197. The next prime is 212432237. The reversal of 212432221 is 122234212.

It can be written as a sum of positive squares in 4 ways, for example, as 54552996 + 157879225 = 7386^2 + 12565^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212432221 - 2¹⁷ = 212301149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212432251) 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, 214956 + ... + 215941.

It is an arithmetic number, because the mean of its divisors is an integer number (29085615).

Almost surely, 2^212432221 is an apocalyptic number.

It is an amenable number.

212432221 is a deficient number, since it is larger than the sum of its proper divisors (20252699).

212432221 is a wasteful number, since it uses less digits than its factorization.

212432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430943.

The product of its digits is 384, while the sum is 19.

The square root of 212432221 is about 14575.0547511836. The cubic root of 212432221 is about 596.6781436505.

Adding to 212432221 its reverse (122234212), we get a palindrome (334666433).

The spelling of 212432221 in words is "two hundred twelve million, four hundred thirty-two thousand, two hundred twenty-one".