21110321331 has 40 divisors (see below), whose sum is σ = 35134032384. Its totient is φ = 12521893680.

The previous prime is 21110321293. The next prime is 21110321333. The reversal of 21110321331 is 13312301112.

21110321331 is a `hidden beast` number, since 2 + 1 + 1 + 10 + 321 + 331 = 666.

It is not a de Polignac number, because 21110321331 - 2¹⁴ = 21110304947 is a prime.

It is a super-2 number, since 2×21110321331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110321333) 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, 210175 + ... + 293928.

Almost surely, 2^21110321331 is an apocalyptic number.

21110321331 is a deficient number, since it is larger than the sum of its proper divisors (14023711053).

21110321331 is a wasteful number, since it uses less digits than its factorization.

21110321331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504173 (or 504164 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21110321331 its reverse (13312301112), we get a palindrome (34422622443).

The spelling of 21110321331 in words is "twenty-one billion, one hundred ten million, three hundred twenty-one thousand, three hundred thirty-one".