21077166533 has 2 divisors, whose sum is σ = 21077166534. Its totient is φ = 21077166532.

The previous prime is 21077166529. The next prime is 21077166541. The reversal of 21077166533 is 33566177012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010746689 + 7066419844 = 118367^2 + 84062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077166533 - 2² = 21077166529 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21077166503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538583266 + 10538583267.

It is an arithmetic number, because the mean of its divisors is an integer number (10538583267).

Almost surely, 2^21077166533 is an apocalyptic number.

It is an amenable number.

21077166533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077166533 is an equidigital number, since it uses as much as digits as its factorization.

21077166533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 21077166533 in words is "twenty-one billion, seventy-seven million, one hundred sixty-six thousand, five hundred thirty-three".