213503205525 has 24 divisors (see below), whose sum is σ = 353007882240. Its totient is φ = 113863242240.

The previous prime is 213503205521. The next prime is 213503205533. The reversal of 213503205525 is 525502305312.

It is not a de Polignac number, because 213503205525 - 2² = 213503205521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213503205521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2088556 + ... + 2188394.

It is an arithmetic number, because the mean of its divisors is an integer number (14708661760).

Almost surely, 2^213503205525 is an apocalyptic number.

213503205525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213503205525 is a deficient number, since it is larger than the sum of its proper divisors (139504676715).

213503205525 is a wasteful number, since it uses less digits than its factorization.

213503205525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128365 (or 128360 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 213503205525 in words is "two hundred thirteen billion, five hundred three million, two hundred five thousand, five hundred twenty-five".