20145132321 has 8 divisors (see below), whose sum is σ = 26861718240. Its totient is φ = 13429317312.

The previous prime is 20145132317. The next prime is 20145132323. The reversal of 20145132321 is 12323154102.

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

It is not a de Polignac number, because 20145132321 - 2² = 20145132317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20145132291 and 20145132300.

It is not an unprimeable number, because it can be changed into a prime (20145132323) 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, 128715 + ... + 238448.

It is an arithmetic number, because the mean of its divisors is an integer number (3357714780).

Almost surely, 2^20145132321 is an apocalyptic number.

It is an amenable number.

20145132321 is a deficient number, since it is larger than the sum of its proper divisors (6716585919).

20145132321 is a wasteful number, since it uses less digits than its factorization.

20145132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385455.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20145132321 its reverse (12323154102), we get a palindrome (32468286423).

The spelling of 20145132321 in words is "twenty billion, one hundred forty-five million, one hundred thirty-two thousand, three hundred twenty-one".