21444033433 has 2 divisors, whose sum is σ = 21444033434. Its totient is φ = 21444033432.

The previous prime is 21444033431. The next prime is 21444033437. The reversal of 21444033433 is 33433044412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19843793424 + 1600240009 = 140868^2 + 40003^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444033433 - 2¹ = 21444033431 is a prime.

Together with 21444033431, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21444033395 and 21444033404.

It is not a weakly prime, because it can be changed into another prime (21444033431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722016716 + 10722016717.

It is an arithmetic number, because the mean of its divisors is an integer number (10722016717).

Almost surely, 2^21444033433 is an apocalyptic number.

It is an amenable number.

21444033433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444033433 is an equidigital number, since it uses as much as digits as its factorization.

21444033433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 21444033433 its reverse (33433044412), we get a palindrome (54877077845).

The spelling of 21444033433 in words is "twenty-one billion, four hundred forty-four million, thirty-three thousand, four hundred thirty-three".