20511412525521 has 48 divisors (see below), whose sum is σ = 32151089792640. Its totient is φ = 12558109674240.

The previous prime is 20511412525511. The next prime is 20511412525529. The reversal of 20511412525521 is 12552521411502.

20511412525521 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 1 + 4 + 125 + 2 + 5 + 521 = 666.

It is not a de Polignac number, because 20511412525521 - 2⁵ = 20511412525489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20511412525529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8216485 + ... + 10417938.

It is an arithmetic number, because the mean of its divisors is an integer number (669814370680).

Almost surely, 2^{20511412525521} is an apocalyptic number.

It is an amenable number.

20511412525521 is a deficient number, since it is larger than the sum of its proper divisors (11639677267119).

20511412525521 is a wasteful number, since it uses less digits than its factorization.

20511412525521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18634646 (or 18634643 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The spelling of 20511412525521 in words is "twenty trillion, five hundred eleven billion, four hundred twelve million, five hundred twenty-five thousand, five hundred twenty-one".