20528986221 has 128 divisors (see below), whose sum is σ = 33965568000. Its totient is φ = 12207283200.

The previous prime is 20528986199. The next prime is 20528986223. The reversal of 20528986221 is 12268982502.

20528986221 is a `hidden beast` number, since 20 + 528 + 9 + 86 + 2 + 21 = 666.

It is not a de Polignac number, because 20528986221 - 2¹¹ = 20528984173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528986223) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 88107121 + ... + 88107353.

It is an arithmetic number, because the mean of its divisors is an integer number (265356000).

Almost surely, 2^20528986221 is an apocalyptic number.

It is an amenable number.

20528986221 is a deficient number, since it is larger than the sum of its proper divisors (13436581779).

20528986221 is a wasteful number, since it uses less digits than its factorization.

20528986221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20528986221 in words is "twenty billion, five hundred twenty-eight million, nine hundred eighty-six thousand, two hundred twenty-one".