201212421444 has 18 divisors (see below), whose sum is σ = 508620287630. Its totient is φ = 67070807136.

The previous prime is 201212421419. The next prime is 201212421467. The reversal of 201212421444 is 444124212102.

201212421444 is a `hidden beast` number, since 2 + 0 + 1 + 212 + 4 + 2 + 1 + 444 = 666.

201212421444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 196390785600 + 4821635844 = 443160^2 + 69438^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2794616929 + ... + 2794617000.

Almost surely, 2^201212421444 is an apocalyptic number.

It is an amenable number.

201212421444 is an abundant number, since it is smaller than the sum of its proper divisors (307407866186).

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

201212421444 is a wasteful number, since it uses less digits than its factorization.

201212421444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589233939 (or 5589233934 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 201212421444 its reverse (444124212102), we get a palindrome (645336633546).

The spelling of 201212421444 in words is "two hundred one billion, two hundred twelve million, four hundred twenty-one thousand, four hundred forty-four".