21100044677 has 2 divisors, whose sum is σ = 21100044678. Its totient is φ = 21100044676.

The previous prime is 21100044607. The next prime is 21100044767. The reversal of 21100044677 is 77644000112.

Together with next prime (21100044767) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19968798721 + 1131245956 = 141311^2 + 33634^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100044677 - 2¹⁶ = 21099979141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100044607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550022338 + 10550022339.

It is an arithmetic number, because the mean of its divisors is an integer number (10550022339).

Almost surely, 2^21100044677 is an apocalyptic number.

It is an amenable number.

21100044677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100044677 is an equidigital number, since it uses as much as digits as its factorization.

21100044677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

Adding to 21100044677 its reverse (77644000112), we get a palindrome (98744044789).

The spelling of 21100044677 in words is "twenty-one billion, one hundred million, forty-four thousand, six hundred seventy-seven".