23420340100021 has 4 divisors (see below), whose sum is σ = 23420398192012. Its totient is φ = 23420282008032.

The previous prime is 23420340100009. The next prime is 23420340100099. The reversal of 23420340100021 is 12000104302432.

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 4627291440996 + 18793048659025 = 2151114^2 + 4335095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23420340100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23420340099965 and 23420340100001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23420340100321) 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, 28437000 + ... + 29248993.

It is an arithmetic number, because the mean of its divisors is an integer number (5855099548003).

Almost surely, 2^{23420340100021} is an apocalyptic number.

It is an amenable number.

23420340100021 is a deficient number, since it is larger than the sum of its proper divisors (58091991).

23420340100021 is an equidigital number, since it uses as much as digits as its factorization.

23420340100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58091990.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 23420340100021 its reverse (12000104302432), we get a palindrome (35420444402453).

The spelling of 23420340100021 in words is "twenty-three trillion, four hundred twenty billion, three hundred forty million, one hundred thousand, twenty-one".