21077110633 has 4 divisors (see below), whose sum is σ = 21111494788. Its totient is φ = 21042726480.

The previous prime is 21077110631. The next prime is 21077110667. The reversal of 21077110633 is 33601177012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2211538729 + 18865571904 = 47027^2 + 137352^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077110633 - 2¹ = 21077110631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21077110595 and 21077110604.

It is not an unprimeable number, because it can be changed into a prime (21077110631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17191158 + ... + 17192383.

It is an arithmetic number, because the mean of its divisors is an integer number (5277873697).

Almost surely, 2^21077110633 is an apocalyptic number.

It is an amenable number.

21077110633 is a deficient number, since it is larger than the sum of its proper divisors (34384155).

21077110633 is an equidigital number, since it uses as much as digits as its factorization.

21077110633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34384154.

The product of its (nonzero) digits is 5292, while the sum is 31.

Adding to 21077110633 its reverse (33601177012), we get a palindrome (54678287645).

The spelling of 21077110633 in words is "twenty-one billion, seventy-seven million, one hundred ten thousand, six hundred thirty-three".