21023340123 has 8 divisors (see below), whose sum is σ = 28627527168. Its totient is φ = 13717356584.

The previous prime is 21023340119. The next prime is 21023340133. The reversal of 21023340123 is 32104332012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21023340123 - 2² = 21023340119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023340123.

It is not an unprimeable number, because it can be changed into a prime (21023340133) 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 7 ways as a sum of consecutive naturals, for example, 74550711 + ... + 74550992.

It is an arithmetic number, because the mean of its divisors is an integer number (3578440896).

Almost surely, 2^21023340123 is an apocalyptic number.

21023340123 is a deficient number, since it is larger than the sum of its proper divisors (7604187045).

21023340123 is a wasteful number, since it uses less digits than its factorization.

21023340123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149101753.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21023340123 its reverse (32104332012), we get a palindrome (53127672135).

The spelling of 21023340123 in words is "twenty-one billion, twenty-three million, three hundred forty thousand, one hundred twenty-three".