21143103444 has 18 divisors (see below), whose sum is σ = 53445067130. Its totient is φ = 7047701136.

The previous prime is 21143103437. The next prime is 21143103451. The reversal of 21143103444 is 44430134112.

21143103444 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 310 + 344 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21143103437) and next prime (21143103451).

It can be written as a sum of positive squares in only one way, i.e., 12575379600 + 8567723844 = 112140^2 + 92562^2 .

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

It is a super-2 number, since 2×21143103444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293654179 + ... + 293654250.

Almost surely, 2^21143103444 is an apocalyptic number.

It is an amenable number.

21143103444 is an abundant number, since it is smaller than the sum of its proper divisors (32301963686).

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

21143103444 is a wasteful number, since it uses less digits than its factorization.

21143103444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587308439 (or 587308434 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21143103444 its reverse (44430134112), we get a palindrome (65573237556).

The spelling of 21143103444 in words is "twenty-one billion, one hundred forty-three million, one hundred three thousand, four hundred forty-four".