21171106052 has 12 divisors (see below), whose sum is σ = 37068458700. Its totient is φ = 10580117856.

The previous prime is 21171106027. The next prime is 21171106067. The reversal of 21171106052 is 25060117112.

It can be written as a sum of positive squares in 2 ways, for example, as 15226079236 + 5945026816 = 123394^2 + 77104^2 .

It is a super-4 number, since 4×21171106052⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1350023 + ... + 1365614.

It is an arithmetic number, because the mean of its divisors is an integer number (3089038225).

Almost surely, 2^21171106052 is an apocalyptic number.

It is an amenable number.

21171106052 is a deficient number, since it is larger than the sum of its proper divisors (15897352648).

21171106052 is a wasteful number, since it uses less digits than its factorization.

21171106052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717590 (or 2717588 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The spelling of 21171106052 in words is "twenty-one billion, one hundred seventy-one million, one hundred six thousand, fifty-two".