20135221712532 has 48 divisors (see below), whose sum is σ = 54472097393280. Its totient is φ = 6419925762624.

The previous prime is 20135221712521. The next prime is 20135221712561. The reversal of 20135221712532 is 23521712253102.

20135221712532 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 52 + 2 + 1 + 71 + 2 + 532 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4052980953 + ... + 4052985920.

It is an arithmetic number, because the mean of its divisors is an integer number (1134835362360).

Almost surely, 2^{20135221712532} is an apocalyptic number.

It is an amenable number.

20135221712532 is an abundant number, since it is smaller than the sum of its proper divisors (34336875680748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20135221712532 is a wasteful number, since it uses less digits than its factorization.

20135221712532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8105966909 (or 8105966901 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

Adding to 20135221712532 its reverse (23521712253102), we get a palindrome (43656933965634).

The spelling of 20135221712532 in words is "twenty trillion, one hundred thirty-five billion, two hundred twenty-one million, seven hundred twelve thousand, five hundred thirty-two".