23420021321 has 8 divisors (see below), whose sum is σ = 24815650824. Its totient is φ = 22026389760.

The previous prime is 23420021227. The next prime is 23420021327. The reversal of 23420021321 is 12312002432.

It can be written as a sum of positive squares in 4 ways, for example, as 677873296 + 22742148025 = 26036^2 + 150805^2 .

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 23420021321 - 2¹⁰ = 23420020297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23420021293 and 23420021302.

It is not an unprimeable number, because it can be changed into a prime (23420021327) 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, 475310 + ... + 522263.

It is an arithmetic number, because the mean of its divisors is an integer number (3101956353).

Almost surely, 2^23420021321 is an apocalyptic number.

It is an amenable number.

23420021321 is a deficient number, since it is larger than the sum of its proper divisors (1395629503).

23420021321 is a wasteful number, since it uses less digits than its factorization.

23420021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998971.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23420021321 its reverse (12312002432), we get a palindrome (35732023753).

The spelling of 23420021321 in words is "twenty-three billion, four hundred twenty million, twenty-one thousand, three hundred twenty-one".