21455552515325 has 6 divisors (see below), whose sum is σ = 26604885119034. Its totient is φ = 17164442012240.

The previous prime is 21455552515291. The next prime is 21455552515333. The reversal of 21455552515325 is 52351525555412.

It can be written as a sum of positive squares in 3 ways, for example, as 6388625270329 + 15066927244996 = 2527573^2 + 3881614^2 .

It is not a de Polignac number, because 21455552515325 - 2⁶ = 21455552515261 is a prime.

It is a super-3 number, since 3×21455552515325³ (a number of 41 digits) contains 333 as substring.

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, 429111050282 + ... + 429111050331.

It is an arithmetic number, because the mean of its divisors is an integer number (4434147519839).

Almost surely, 2^{21455552515325} is an apocalyptic number.

21455552515325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21455552515325 is a deficient number, since it is larger than the sum of its proper divisors (5149332603709).

21455552515325 is an equidigital number, since it uses as much as digits as its factorization.

21455552515325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858222100623 (or 858222100618 counting only the distinct ones).

The product of its digits is 7500000, while the sum is 50.

The spelling of 21455552515325 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred fifty-two million, five hundred fifteen thousand, three hundred twenty-five".