21230102123 has 4 divisors (see below), whose sum is σ = 21962174640. Its totient is φ = 20498029608.

The previous prime is 21230102099. The next prime is 21230102149. The reversal of 21230102123 is 32120103212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21230102123 - 2¹⁴ = 21230085739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230102423) 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 3 ways as a sum of consecutive naturals, for example, 366036215 + ... + 366036272.

It is an arithmetic number, because the mean of its divisors is an integer number (5490543660).

Almost surely, 2^21230102123 is an apocalyptic number.

21230102123 is a deficient number, since it is larger than the sum of its proper divisors (732072517).

21230102123 is an equidigital number, since it uses as much as digits as its factorization.

21230102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732072516.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21230102123 its reverse (32120103212), we get a palindrome (53350205335).

The spelling of 21230102123 in words is "twenty-one billion, two hundred thirty million, one hundred two thousand, one hundred twenty-three".