21436183777 has 2 divisors, whose sum is σ = 21436183778. Its totient is φ = 21436183776.

The previous prime is 21436183763. The next prime is 21436183801. The reversal of 21436183777 is 77738163412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13010596096 + 8425587681 = 114064^2 + 91791^2 .

It is a cyclic number.

It is not a de Polignac number, because 21436183777 - 2¹⁹ = 21435659489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21436183777.

It is not a weakly prime, because it can be changed into another prime (21436183277) 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 as a sum of consecutive naturals, namely, 10718091888 + 10718091889.

It is an arithmetic number, because the mean of its divisors is an integer number (10718091889).

Almost surely, 2^21436183777 is an apocalyptic number.

It is an amenable number.

21436183777 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436183777 is an equidigital number, since it uses as much as digits as its factorization.

21436183777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 49.

The spelling of 21436183777 in words is "twenty-one billion, four hundred thirty-six million, one hundred eighty-three thousand, seven hundred seventy-seven".