21533204034 has 24 divisors (see below), whose sum is σ = 46787457132. Its totient is φ = 7157399040.

The previous prime is 21533204009. The next prime is 21533204039. The reversal of 21533204034 is 43040233512.

It can be written as a sum of positive squares in 2 ways, for example, as 19548234225 + 1984969809 = 139815^2 + 44553^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21533203989 and 21533204007.

It is not an unprimeable number, because it can be changed into a prime (21533204039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1688107 + ... + 1700814.

Almost surely, 2^21533204034 is an apocalyptic number.

21533204034 is an abundant number, since it is smaller than the sum of its proper divisors (25254253098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21533204034 is a wasteful number, since it uses less digits than its factorization.

21533204034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3389282 (or 3389279 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 21533204034 its reverse (43040233512), we get a palindrome (64573437546).

The spelling of 21533204034 in words is "twenty-one billion, five hundred thirty-three million, two hundred four thousand, thirty-four".