21301233123 has 32 divisors (see below), whose sum is σ = 29189774592. Its totient is φ = 13812739200.

The previous prime is 21301233073. The next prime is 21301233131. The reversal of 21301233123 is 32133210312.

It is a de Polignac number, because none of the positive numbers 2^k-21301233123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21301233123.

It is not an unprimeable number, because it can be changed into a prime (21301223123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7598040 + ... + 7600842.

It is an arithmetic number, because the mean of its divisors is an integer number (912180456).

Almost surely, 2^21301233123 is an apocalyptic number.

21301233123 is a deficient number, since it is larger than the sum of its proper divisors (7888541469).

21301233123 is a wasteful number, since it uses less digits than its factorization.

21301233123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21301233123 its reverse (32133210312), we get a palindrome (53434443435).

The spelling of 21301233123 in words is "twenty-one billion, three hundred one million, two hundred thirty-three thousand, one hundred twenty-three".