21444032133 has 6 divisors (see below), whose sum is σ = 30974713094. Its totient is φ = 14296021416.

The previous prime is 21444031967. The next prime is 21444032143. The reversal of 21444032133 is 33123044412.

21444032133 is a `hidden beast` number, since 2 + 1 + 4 + 440 + 3 + 213 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16787607489 + 4656424644 = 129567^2 + 68238^2 .

It is not a de Polignac number, because 21444032133 - 2¹⁶ = 21443966597 is a prime.

It is a super-2 number, since 2×21444032133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444032097 and 21444032106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444032143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191335110 + ... + 1191335127.

Almost surely, 2^21444032133 is an apocalyptic number.

It is an amenable number.

21444032133 is a deficient number, since it is larger than the sum of its proper divisors (9530680961).

21444032133 is a wasteful number, since it uses less digits than its factorization.

21444032133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382670243 (or 2382670240 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21444032133 its reverse (33123044412), we get a palindrome (54567076545).

The spelling of 21444032133 in words is "twenty-one billion, four hundred forty-four million, thirty-two thousand, one hundred thirty-three".