23121220321 has 4 divisors (see below), whose sum is σ = 23124380692. Its totient is φ = 23118059952.

The previous prime is 23121220313. The next prime is 23121220333. The reversal of 23121220321 is 12302212132.

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 226201600 + 22895018721 = 15040^2 + 151311^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121220321 - 2³ = 23121220313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121220721) 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, 1569186 + ... + 1583851.

It is an arithmetic number, because the mean of its divisors is an integer number (5781095173).

Almost surely, 2^23121220321 is an apocalyptic number.

It is an amenable number.

23121220321 is a deficient number, since it is larger than the sum of its proper divisors (3160371).

23121220321 is an equidigital number, since it uses as much as digits as its factorization.

23121220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160370.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 23121220321 its reverse (12302212132), we get a palindrome (35423432453).

The spelling of 23121220321 in words is "twenty-three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty-one".