212001423444 has 30 divisors (see below), whose sum is σ = 554213598554. Its totient is φ = 70667141040.

The previous prime is 212001423391. The next prime is 212001423451. The reversal of 212001423444 is 444324100212.

212001423444 is a `hidden beast` number, since 2 + 1 + 200 + 14 + 2 + 3 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128371724100 + 83629699344 = 358290^2 + 289188^2 .

It is a super-2 number, since 2×212001423444² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 327162367 + ... + 327163014.

Almost surely, 2^212001423444 is an apocalyptic number.

It is an amenable number.

212001423444 is an abundant number, since it is smaller than the sum of its proper divisors (342212175110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212001423444 is a wasteful number, since it uses less digits than its factorization.

212001423444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654325397 (or 654325386 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 212001423444 its reverse (444324100212), we get a palindrome (656325523656).

The spelling of 212001423444 in words is "two hundred twelve billion, one million, four hundred twenty-three thousand, four hundred forty-four".