21123202023 has 24 divisors (see below), whose sum is σ = 38040053376. Its totient is φ = 10973091600.

The previous prime is 21123201997. The next prime is 21123202039. The reversal of 21123202023 is 32020232112.

It is not a de Polignac number, because 21123202023 - 2⁵ = 21123201991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123201987 and 21123202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123202043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15239713 + ... + 15241098.

It is an arithmetic number, because the mean of its divisors is an integer number (1585002224).

Almost surely, 2^21123202023 is an apocalyptic number.

21123202023 is a deficient number, since it is larger than the sum of its proper divisors (16916851353).

21123202023 is a wasteful number, since it uses less digits than its factorization.

21123202023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30480835 (or 30480832 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21123202023 its reverse (32020232112), we get a palindrome (53143434135).

The spelling of 21123202023 in words is "twenty-one billion, one hundred twenty-three million, two hundred two thousand, twenty-three".