21077166535 has 12 divisors (see below), whose sum is σ = 26440093512. Its totient is φ = 16128612368.

The previous prime is 21077166533. The next prime is 21077166541. The reversal of 21077166535 is 53566177012.

It is not a de Polignac number, because 21077166535 - 2¹ = 21077166533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21077166491 and 21077166500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077166533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3981697 + ... + 3986986.

It is an arithmetic number, because the mean of its divisors is an integer number (2203341126).

Almost surely, 2^21077166535 is an apocalyptic number.

21077166535 is a deficient number, since it is larger than the sum of its proper divisors (5362926977).

21077166535 is an equidigital number, since it uses as much as digits as its factorization.

21077166535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968734 (or 7968711 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 21077166535 in words is "twenty-one billion, seventy-seven million, one hundred sixty-six thousand, five hundred thirty-five".