21433031033 has 16 divisors (see below), whose sum is σ = 22226746896. Its totient is φ = 20650936320.

The previous prime is 21433031023. The next prime is 21433031041. The reversal of 21433031033 is 33013033412.

It can be written as a sum of positive squares in 8 ways, for example, as 9572078569 + 11860952464 = 97837^2 + 108908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433031033 - 2⁸ = 21433030777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433031023) 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, 9000503 + ... + 9002883.

It is an arithmetic number, because the mean of its divisors is an integer number (1389171681).

Almost surely, 2^21433031033 is an apocalyptic number.

It is an amenable number.

21433031033 is a deficient number, since it is larger than the sum of its proper divisors (793715863).

21433031033 is a wasteful number, since it uses less digits than its factorization.

21433031033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21433031033 its reverse (33013033412), we get a palindrome (54446064445).

The spelling of 21433031033 in words is "twenty-one billion, four hundred thirty-three million, thirty-one thousand, thirty-three".