212443021 has 8 divisors (see below), whose sum is σ = 242889920. Its totient is φ = 182020608.

The previous prime is 212443001. The next prime is 212443057. The reversal of 212443021 is 120344212.

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

It is not a de Polignac number, because 212443021 - 2¹³ = 212434829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212443021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212443001) 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, 19810 + ... + 28588.

It is an arithmetic number, because the mean of its divisors is an integer number (30361240).

Almost surely, 2^212443021 is an apocalyptic number.

It is an amenable number.

212443021 is a deficient number, since it is larger than the sum of its proper divisors (30446899).

212443021 is an equidigital number, since it uses as much as digits as its factorization.

212443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12243.

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

The square root of 212443021 is about 14575.4252425101. The cubic root of 212443021 is about 596.6882551340.

Adding to 212443021 its reverse (120344212), we get a palindrome (332787233).

The spelling of 212443021 in words is "two hundred twelve million, four hundred forty-three thousand, twenty-one".