21033013331 has 8 divisors (see below), whose sum is σ = 23685270528. Its totient is φ = 18504117000.

The previous prime is 21033013283. The next prime is 21033013349. The reversal of 21033013331 is 13331033012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21033013331 - 2¹⁰ = 21033012307 is a prime.

It is a super-2 number, since 2×21033013331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033013361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30839855 + ... + 30840536.

It is an arithmetic number, because the mean of its divisors is an integer number (2960658816).

Almost surely, 2^21033013331 is an apocalyptic number.

21033013331 is a deficient number, since it is larger than the sum of its proper divisors (2652257197).

21033013331 is a wasteful number, since it uses less digits than its factorization.

21033013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61680433.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21033013331 its reverse (13331033012), we get a palindrome (34364046343).

The spelling of 21033013331 in words is "twenty-one billion, thirty-three million, thirteen thousand, three hundred thirty-one".