21030232210123 has 4 divisors (see below), whose sum is σ = 21030245100568. Its totient is φ = 21030219319680.

The previous prime is 21030232210081. The next prime is 21030232210139. The reversal of 21030232210123 is 32101223203012.

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 21030232210123 - 2³³ = 21021642275531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030232210094 and 21030232210103.

It is not an unprimeable number, because it can be changed into a prime (21030232210153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570693 + ... + 7403398.

It is an arithmetic number, because the mean of its divisors is an integer number (5257561275142).

Almost surely, 2^{21030232210123} is an apocalyptic number.

21030232210123 is a deficient number, since it is larger than the sum of its proper divisors (12890445).

21030232210123 is a wasteful number, since it uses less digits than its factorization.

21030232210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12890444.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21030232210123 its reverse (32101223203012), we get a palindrome (53131455413135).

The spelling of 21030232210123 in words is "twenty-one trillion, thirty billion, two hundred thirty-two million, two hundred ten thousand, one hundred twenty-three".