21077171071 has 16 divisors (see below), whose sum is σ = 23128934400. Its totient is φ = 19048153600.

The previous prime is 21077171057. The next prime is 21077171099. The reversal of 21077171071 is 17017177012.

It is a cyclic number.

It is not a de Polignac number, because 21077171071 - 2⁷ = 21077170943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077171021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4912095 + ... + 4916383.

It is an arithmetic number, because the mean of its divisors is an integer number (1445558400).

Almost surely, 2^21077171071 is an apocalyptic number.

21077171071 is a deficient number, since it is larger than the sum of its proper divisors (2051763329).

21077171071 is a wasteful number, since it uses less digits than its factorization.

21077171071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6830.

The product of its (nonzero) digits is 4802, while the sum is 34.

The spelling of 21077171071 in words is "twenty-one billion, seventy-seven million, one hundred seventy-one thousand, seventy-one".