21230123110001 has 4 divisors (see below), whose sum is σ = 22863209503092. Its totient is φ = 19597036716912.

The previous prime is 21230123109983. The next prime is 21230123110067. The reversal of 21230123110001 is 10001132103212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10328504012401 + 10901619097600 = 3213799^2 + 3301760^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230123110001 - 2²² = 21230118915697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230123116001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816543196526 + ... + 816543196551.

It is an arithmetic number, because the mean of its divisors is an integer number (5715802375773).

Almost surely, 2^{21230123110001} is an apocalyptic number.

It is an amenable number.

21230123110001 is a deficient number, since it is larger than the sum of its proper divisors (1633086393091).

21230123110001 is a wasteful number, since it uses less digits than its factorization.

21230123110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633086393090.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21230123110001 its reverse (10001132103212), we get a palindrome (31231255213213).

The spelling of 21230123110001 in words is "twenty-one trillion, two hundred thirty billion, one hundred twenty-three million, one hundred ten thousand, one".