21106755273 has 16 divisors (see below), whose sum is σ = 28280041920. Its totient is φ = 14002384704.

The previous prime is 21106755247. The next prime is 21106755281. The reversal of 21106755273 is 37255760112.

It is a happy number.

It is not a de Polignac number, because 21106755273 - 2²⁰ = 21105706697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21106755223) 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 15 ways as a sum of consecutive naturals, for example, 1513390 + ... + 1527272.

It is an arithmetic number, because the mean of its divisors is an integer number (1767502620).

Almost surely, 2^21106755273 is an apocalyptic number.

It is an amenable number.

21106755273 is a deficient number, since it is larger than the sum of its proper divisors (7173286647).

21106755273 is a wasteful number, since it uses less digits than its factorization.

21106755273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16328.

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 21106755273 in words is "twenty-one billion, one hundred six million, seven hundred fifty-five thousand, two hundred seventy-three".