20425555321 has 4 divisors (see below), whose sum is σ = 20627788644. Its totient is φ = 20223322000.

The previous prime is 20425555303. The next prime is 20425555343. The reversal of 20425555321 is 12355552402.

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 16573987600 + 3851567721 = 128740^2 + 62061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20425555321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425555391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101116510 + ... + 101116711.

It is an arithmetic number, because the mean of its divisors is an integer number (5156947161).

Almost surely, 2^20425555321 is an apocalyptic number.

It is an amenable number.

20425555321 is a deficient number, since it is larger than the sum of its proper divisors (202233323).

20425555321 is a wasteful number, since it uses less digits than its factorization.

20425555321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202233322.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 20425555321 in words is "twenty billion, four hundred twenty-five million, five hundred fifty-five thousand, three hundred twenty-one".