23440420021 has 8 divisors (see below), whose sum is σ = 24012030944. Its totient is φ = 22870013040.

The previous prime is 23440420019. The next prime is 23440420037. The reversal of 23440420021 is 12002404432.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23440420021 - 2¹ = 23440420019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23440419974 and 23440420001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440420051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261510 + ... + 339511.

It is an arithmetic number, because the mean of its divisors is an integer number (3001503868).

Almost surely, 2^23440420021 is an apocalyptic number.

It is an amenable number.

23440420021 is a deficient number, since it is larger than the sum of its proper divisors (571610923).

23440420021 is an equidigital number, since it uses as much as digits as its factorization.

23440420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601971.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 23440420021 its reverse (12002404432), we get a palindrome (35442824453).

The spelling of 23440420021 in words is "twenty-three billion, four hundred forty million, four hundred twenty thousand, twenty-one".