20154012321 has 4 divisors (see below), whose sum is σ = 26872016432. Its totient is φ = 13436008212.

The previous prime is 20154012317. The next prime is 20154012337. The reversal of 20154012321 is 12321045102.

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 not a de Polignac number, because 20154012321 - 2² = 20154012317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154012341) 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, 3359002051 + ... + 3359002056.

It is an arithmetic number, because the mean of its divisors is an integer number (6718004108).

Almost surely, 2^20154012321 is an apocalyptic number.

It is an amenable number.

20154012321 is a deficient number, since it is larger than the sum of its proper divisors (6718004111).

20154012321 is an equidigital number, since it uses as much as digits as its factorization.

20154012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718004110.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20154012321 its reverse (12321045102), we get a palindrome (32475057423).

The spelling of 20154012321 in words is "twenty billion, one hundred fifty-four million, twelve thousand, three hundred twenty-one".