21552503242525 has 12 divisors (see below), whose sum is σ = 26735316216532. Its totient is φ = 17235414080640.

The previous prime is 21552503242489. The next prime is 21552503242541. The reversal of 21552503242525 is 52524230525512.

It can be written as a sum of positive squares in 6 ways, for example, as 806400408004 + 20746102834521 = 897998^2 + 4554789^2 .

It is not a de Polignac number, because 21552503242525 - 2⁹ = 21552503242013 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 11 ways as a sum of consecutive naturals, for example, 164646102 + ... + 164776951.

Almost surely, 2^{21552503242525} is an apocalyptic number.

21552503242525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21552503242525 is a deficient number, since it is larger than the sum of its proper divisors (5182812974007).

21552503242525 is a wasteful number, since it uses less digits than its factorization.

21552503242525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329425680 (or 329425675 counting only the distinct ones).

The product of its (nonzero) digits is 1200000, while the sum is 43.

The spelling of 21552503242525 in words is "twenty-one trillion, five hundred fifty-two billion, five hundred three million, two hundred forty-two thousand, five hundred twenty-five".