21330123311 has 12 divisors (see below), whose sum is σ = 26118519480. Its totient is φ = 17320700880.

The previous prime is 21330123307. The next prime is 21330123313. The reversal of 21330123311 is 11332103312.

It is not a de Polignac number, because 21330123311 - 2² = 21330123307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330123313) 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, 11454560 + ... + 11456421.

It is an arithmetic number, because the mean of its divisors is an integer number (2176543290).

Almost surely, 2^21330123311 is an apocalyptic number.

21330123311 is a deficient number, since it is larger than the sum of its proper divisors (4788396169).

21330123311 is a wasteful number, since it uses less digits than its factorization.

21330123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911014 (or 22911007 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21330123311 its reverse (11332103312), we get a palindrome (32662226623).

The spelling of 21330123311 in words is "twenty-one billion, three hundred thirty million, one hundred twenty-three thousand, three hundred eleven".