21520020302577 has 12 divisors (see below), whose sum is σ = 31084654903120. Its totient is φ = 14346596602008.

The previous prime is 21520020302567. The next prime is 21520020302609. The reversal of 21520020302577 is 77520302002512.

21520020302577 is a `hidden beast` number, since 2 + 1 + 52 + 0 + 0 + 2 + 0 + 30 + 2 + 577 = 666.

It is not a de Polignac number, because 21520020302577 - 2¹⁶ = 21520020237041 is a prime.

It is a super-3 number, since 3×21520020302577³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21520020302567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5315743 + ... + 8443764.

Almost surely, 2^{21520020302577} is an apocalyptic number.

It is an amenable number.

21520020302577 is a deficient number, since it is larger than the sum of its proper divisors (9564634600543).

21520020302577 is a wasteful number, since it uses less digits than its factorization.

21520020302577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13933292 (or 13933289 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 21520020302577 in words is "twenty-one trillion, five hundred twenty billion, twenty million, three hundred two thousand, five hundred seventy-seven".