21444142033 has 2 divisors, whose sum is σ = 21444142034. Its totient is φ = 21444142032.

The previous prime is 21444142021. The next prime is 21444142043. The reversal of 21444142033 is 33024144412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13171693824 + 8272448209 = 114768^2 + 90953^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444142033 - 2³³ = 12854207441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21444141992 and 21444142010.

It is not a weakly prime, because it can be changed into another prime (21444142003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722071016 + 10722071017.

It is an arithmetic number, because the mean of its divisors is an integer number (10722071017).

Almost surely, 2^21444142033 is an apocalyptic number.

It is an amenable number.

21444142033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444142033 is an equidigital number, since it uses as much as digits as its factorization.

21444142033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21444142033 its reverse (33024144412), we get a palindrome (54468286445).

The spelling of 21444142033 in words is "twenty-one billion, four hundred forty-four million, one hundred forty-two thousand, thirty-three".