20551334321 has 4 divisors (see below), whose sum is σ = 23487239232. Its totient is φ = 17615429412.

The previous prime is 20551334291. The next prime is 20551334399. The reversal of 20551334321 is 12343315502.

It is a happy number.

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 de Polignac number, because none of the positive numbers 2^k-20551334321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551330321) 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, 1467952445 + ... + 1467952458.

It is an arithmetic number, because the mean of its divisors is an integer number (5871809808).

Almost surely, 2^20551334321 is an apocalyptic number.

It is an amenable number.

20551334321 is a deficient number, since it is larger than the sum of its proper divisors (2935904911).

20551334321 is an equidigital number, since it uses as much as digits as its factorization.

20551334321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935904910.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20551334321 its reverse (12343315502), we get a palindrome (32894649823).

The spelling of 20551334321 in words is "twenty billion, five hundred fifty-one million, three hundred thirty-four thousand, three hundred twenty-one".