20123132231221 has 4 divisors (see below), whose sum is σ = 20164116207744. Its totient is φ = 20082148254700.

The previous prime is 20123132231143. The next prime is 20123132231291. The reversal of 20123132231221 is 12213223132102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123132231221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123132231291) 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, 20491987525 + ... + 20491988506.

It is an arithmetic number, because the mean of its divisors is an integer number (5041029051936).

Almost surely, 2^{20123132231221} is an apocalyptic number.

It is an amenable number.

20123132231221 is a deficient number, since it is larger than the sum of its proper divisors (40983976523).

20123132231221 is an equidigital number, since it uses as much as digits as its factorization.

20123132231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40983976522.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20123132231221 its reverse (12213223132102), we get a palindrome (32336355363323).

The spelling of 20123132231221 in words is "twenty trillion, one hundred twenty-three billion, one hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty-one".