21000323331 has 40 divisors (see below), whose sum is σ = 33802211520. Its totient is φ = 12916309248.

The previous prime is 21000323303. The next prime is 21000323341. The reversal of 21000323331 is 13332300012.

21000323331 is a `hidden beast` number, since 2 + 10 + 0 + 0 + 323 + 331 = 666.

It is not a de Polignac number, because 21000323331 - 2¹⁰ = 21000322307 is a prime.

It is a super-2 number, since 2×21000323331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21000323341) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2505115 + ... + 2513483.

It is an arithmetic number, because the mean of its divisors is an integer number (845055288).

Almost surely, 2^21000323331 is an apocalyptic number.

21000323331 is a deficient number, since it is larger than the sum of its proper divisors (12801888189).

21000323331 is a wasteful number, since it uses less digits than its factorization.

21000323331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10777 (or 10768 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21000323331 its reverse (13332300012), we get a palindrome (34332623343).

The spelling of 21000323331 in words is "twenty-one billion, three hundred twenty-three thousand, three hundred thirty-one".