21726771087 has 32 divisors (see below), whose sum is σ = 34283059200. Its totient is φ = 11975298048.

The previous prime is 21726771049. The next prime is 21726771109. The reversal of 21726771087 is 78017762712.

It is not a de Polignac number, because 21726771087 - 2⁶ = 21726771023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726721087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 615583 + ... + 649919.

It is an arithmetic number, because the mean of its divisors is an integer number (1071345600).

Almost surely, 2^21726771087 is an apocalyptic number.

21726771087 is a deficient number, since it is larger than the sum of its proper divisors (12556288113).

21726771087 is a wasteful number, since it uses less digits than its factorization.

21726771087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35415.

The product of its (nonzero) digits is 460992, while the sum is 48.

The spelling of 21726771087 in words is "twenty-one billion, seven hundred twenty-six million, seven hundred seventy-one thousand, eighty-seven".