21021111330331 has 16 divisors (see below), whose sum is σ = 24689888352000. Its totient is φ = 17519424340320.

The previous prime is 21021111330239. The next prime is 21021111330343. The reversal of 21021111330331 is 13303311112012.

It is not a de Polignac number, because 21021111330331 - 2²³ = 21021102941723 is a prime.

It is a super-3 number, since 3×21021111330331³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021111330631) 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, 26684005 + ... + 27460486.

It is an arithmetic number, because the mean of its divisors is an integer number (1543118022000).

Almost surely, 2^{21021111330331} is an apocalyptic number.

21021111330331 is a deficient number, since it is larger than the sum of its proper divisors (3668777021669).

21021111330331 is a wasteful number, since it uses less digits than its factorization.

21021111330331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54146034.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21021111330331 its reverse (13303311112012), we get a palindrome (34324422442343).

The spelling of 21021111330331 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, three hundred thirty thousand, three hundred thirty-one".