21123334334331 has 12 divisors (see below), whose sum is σ = 32117350450120. Its totient is φ = 13341053263680.

The previous prime is 21123334334321. The next prime is 21123334334359. The reversal of 21123334334331 is 13343343332112.

21123334334331 is a `hidden beast` number, since 2 + 1 + 123 + 33 + 433 + 43 + 31 = 666.

It is not a de Polignac number, because 21123334334331 - 2¹⁰ = 21123334333307 is a prime.

It is a super-2 number, since 2×21123334334331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123334334321) 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, 61764135310 + ... + 61764135651.

Almost surely, 2^{21123334334331} is an apocalyptic number.

21123334334331 is a deficient number, since it is larger than the sum of its proper divisors (10994016115789).

21123334334331 is a wasteful number, since it uses less digits than its factorization.

21123334334331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123528270986 (or 123528270983 counting only the distinct ones).

The product of its digits is 139968, while the sum is 36.

Adding to 21123334334331 its reverse (13343343332112), we get a palindrome (34466677666443).

The spelling of 21123334334331 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred thirty-four million, three hundred thirty-four thousand, three hundred thirty-one".