21444402312 has 24 divisors (see below), whose sum is σ = 58078589790. Its totient is φ = 7148134080.

The previous prime is 21444402311. The next prime is 21444402347. The reversal of 21444402312 is 21320444412.

21444402312 is a `hidden beast` number, since 214 + 4 + 440 + 2 + 3 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16120365156 + 5324037156 = 126966^2 + 72966^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21444402311) by changing a digit.

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, 148919389 + ... + 148919532.

Almost surely, 2^21444402312 is an apocalyptic number.

It is an amenable number.

21444402312 is an abundant number, since it is smaller than the sum of its proper divisors (36634187478).

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

21444402312 is a wasteful number, since it uses less digits than its factorization.

21444402312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297838933 (or 297838926 counting only the distinct ones).

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

Adding to 21444402312 its reverse (21320444412), we get a palindrome (42764846724).

The spelling of 21444402312 in words is "twenty-one billion, four hundred forty-four million, four hundred two thousand, three hundred twelve".