21325555325 has 6 divisors (see below), whose sum is σ = 26443688634. Its totient is φ = 17060444240.

The previous prime is 21325555319. The next prime is 21325555337. The reversal of 21325555325 is 52355552312.

It can be written as a sum of positive squares in 3 ways, for example, as 2159367961 + 19166187364 = 46469^2 + 138442^2 .

It is not a de Polignac number, because 21325555325 - 2¹² = 21325551229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426511082 + ... + 426511131.

It is an arithmetic number, because the mean of its divisors is an integer number (4407281439).

Almost surely, 2^21325555325 is an apocalyptic number.

21325555325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21325555325 is a deficient number, since it is larger than the sum of its proper divisors (5118133309).

21325555325 is an equidigital number, since it uses as much as digits as its factorization.

21325555325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853022223 (or 853022218 counting only the distinct ones).

The product of its digits is 225000, while the sum is 38.

The spelling of 21325555325 in words is "twenty-one billion, three hundred twenty-five million, five hundred fifty-five thousand, three hundred twenty-five".