23123421321 has 64 divisors (see below), whose sum is σ = 42514784256. Its totient is φ = 10788422400.

The previous prime is 23123421319. The next prime is 23123421337. The reversal of 23123421321 is 12312432132.

It is not a de Polignac number, because 23123421321 - 2¹ = 23123421319 is a prime.

It is a super-2 number, since 2×23123421321² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23123421291 and 23123421300.

It is not an unprimeable number, because it can be changed into a prime (23123421371) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7056 + ... + 215166.

It is an arithmetic number, because the mean of its divisors is an integer number (664293504).

Almost surely, 2^23123421321 is an apocalyptic number.

23123421321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23123421321 is a deficient number, since it is larger than the sum of its proper divisors (19391362935).

23123421321 is a wasteful number, since it uses less digits than its factorization.

23123421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208182.

The product of its digits is 1728, while the sum is 24.

Adding to 23123421321 its reverse (12312432132), we get a palindrome (35435853453).

It can be divided in two parts, 23123 and 421321, that added together give a palindrome (444444).

The spelling of 23123421321 in words is "twenty-three billion, one hundred twenty-three million, four hundred twenty-one thousand, three hundred twenty-one".