212644421 has 16 divisors (see below), whose sum is σ = 234861120. Its totient is φ = 190926720.

The previous prime is 212644387. The next prime is 212644429. The reversal of 212644421 is 124446212.

It is a cyclic number.

It is not a de Polignac number, because 212644421 - 2¹⁸ = 212382277 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 (212644429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417515 + ... + 418023.

It is an arithmetic number, because the mean of its divisors is an integer number (14678820).

Almost surely, 2^212644421 is an apocalyptic number.

It is an amenable number.

212644421 is a deficient number, since it is larger than the sum of its proper divisors (22216699).

212644421 is a wasteful number, since it uses less digits than its factorization.

212644421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916.

The product of its digits is 3072, while the sum is 26.

The square root of 212644421 is about 14582.3324951806. The cubic root of 212644421 is about 596.8767528287.

The spelling of 212644421 in words is "two hundred twelve million, six hundred forty-four thousand, four hundred twenty-one".