21533237269 has 16 divisors (see below), whose sum is σ = 22582317744. Its totient is φ = 20514816000.

The previous prime is 21533237207. The next prime is 21533237309. The reversal of 21533237269 is 96273233512.

It can be written as a sum of positive squares in 8 ways, for example, as 577200625 + 20956036644 = 24025^2 + 144762^2 .

It is a cyclic number.

It is not a de Polignac number, because 21533237269 - 2⁹ = 21533236757 is a prime.

It is a super-2 number, since 2×21533237269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533232269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266677 + ... + 337909.

It is an arithmetic number, because the mean of its divisors is an integer number (1411394859).

Almost surely, 2^21533237269 is an apocalyptic number.

It is an amenable number.

21533237269 is a deficient number, since it is larger than the sum of its proper divisors (1049080475).

21533237269 is a wasteful number, since it uses less digits than its factorization.

21533237269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71448.

The product of its digits is 408240, while the sum is 43.

The spelling of 21533237269 in words is "twenty-one billion, five hundred thirty-three million, two hundred thirty-seven thousand, two hundred sixty-nine".