20521522635523 has 8 divisors (see below), whose sum is σ = 25257258628448. Its totient is φ = 16236809118144.

The previous prime is 20521522635517. The next prime is 20521522635541. The reversal of 20521522635523 is 32553622512502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20521522635523 - 2⁹ = 20521522635011 is a prime.

It is a super-2 number, since 2×20521522635523² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521522635523.

It is not an unprimeable number, because it can be changed into a prime (20521522635553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112755618786 + ... + 112755618967.

It is an arithmetic number, because the mean of its divisors is an integer number (3157157328556).

Almost surely, 2^{20521522635523} is an apocalyptic number.

20521522635523 is a deficient number, since it is larger than the sum of its proper divisors (4735735992925).

20521522635523 is a wasteful number, since it uses less digits than its factorization.

20521522635523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225511237773.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 20521522635523 in words is "twenty trillion, five hundred twenty-one billion, five hundred twenty-two million, six hundred thirty-five thousand, five hundred twenty-three".