21123512333 has 64 divisors (see below), whose sum is σ = 30365798400. Its totient is φ = 14169738240.

The previous prime is 21123512329. The next prime is 21123512341. The reversal of 21123512333 is 33321532112.

It is not a de Polignac number, because 21123512333 - 2² = 21123512329 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123512323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 706616 + ... + 735902.

It is an arithmetic number, because the mean of its divisors is an integer number (474465600).

Almost surely, 2^21123512333 is an apocalyptic number.

It is an amenable number.

21123512333 is a deficient number, since it is larger than the sum of its proper divisors (9242286067).

21123512333 is a wasteful number, since it uses less digits than its factorization.

21123512333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29370.

The product of its digits is 3240, while the sum is 26.

The spelling of 21123512333 in words is "twenty-one billion, one hundred twenty-three million, five hundred twelve thousand, three hundred thirty-three".