21110231331 has 48 divisors (see below), whose sum is σ = 35825986560. Its totient is φ = 11726778240.

The previous prime is 21110231327. The next prime is 21110231353. The reversal of 21110231331 is 13313201112.

It is not a de Polignac number, because 21110231331 - 2² = 21110231327 is a prime.

It is a super-2 number, since 2×21110231331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110231431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 716550 + ... + 745428.

It is an arithmetic number, because the mean of its divisors is an integer number (746374720).

Almost surely, 2^21110231331 is an apocalyptic number.

21110231331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21110231331 is a deficient number, since it is larger than the sum of its proper divisors (14715755229).

21110231331 is a wasteful number, since it uses less digits than its factorization.

21110231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29216 (or 29213 counting only the distinct ones).

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

Adding to 21110231331 its reverse (13313201112), we get a palindrome (34423432443).

The spelling of 21110231331 in words is "twenty-one billion, one hundred ten million, two hundred thirty-one thousand, three hundred thirty-one".