21533020312 has 32 divisors (see below), whose sum is σ = 40647578400. Its totient is φ = 10693900800.

The previous prime is 21533020309. The next prime is 21533020409. The reversal of 21533020312 is 21302033512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735637 + ... + 764347.

It is an arithmetic number, because the mean of its divisors is an integer number (1270236825).

Almost surely, 2^21533020312 is an apocalyptic number.

It is an amenable number.

21533020312 is a deficient number, since it is larger than the sum of its proper divisors (19114558088).

21533020312 is a wasteful number, since it uses less digits than its factorization.

21533020312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29347 (or 29343 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21533020312 its reverse (21302033512), we get a palindrome (42835053824).

The spelling of 21533020312 in words is "twenty-one billion, five hundred thirty-three million, twenty thousand, three hundred twelve".