21787672210533 has 6 divisors (see below), whose sum is σ = 31471082081894. Its totient is φ = 14525114807016.

The previous prime is 21787672210511. The next prime is 21787672210541. The reversal of 21787672210533 is 33501227678712.

21787672210533 is a `hidden beast` number, since 2 + 1 + 7 + 8 + 76 + 7 + 22 + 10 + 533 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21785910981444 + 1761229089 = 4667538^2 + 41967^2 .

It is not a de Polignac number, because 21787672210533 - 2¹⁷ = 21787672079461 is a prime.

It is a super-2 number, since 2×21787672210533² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21787672210533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21787672210543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1210426233910 + ... + 1210426233927.

Almost surely, 2^{21787672210533} is an apocalyptic number.

It is an amenable number.

21787672210533 is a deficient number, since it is larger than the sum of its proper divisors (9683409871361).

21787672210533 is a wasteful number, since it uses less digits than its factorization.

21787672210533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420852467843 (or 2420852467840 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 21787672210533 in words is "twenty-one trillion, seven hundred eighty-seven billion, six hundred seventy-two million, two hundred ten thousand, five hundred thirty-three".