36677777021 has 2 divisors, whose sum is σ = 36677777022. Its totient is φ = 36677777020.

The previous prime is 36677776957. The next prime is 36677777047. The reversal of 36677777021 is 12077777663.

It is a happy number.

36677777021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36408456100 + 269320921 = 190810^2 + 16411^2 .

It is a cyclic number.

It is not a de Polignac number, because 36677777021 - 2⁶ = 36677776957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36677777051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18338888510 + 18338888511.

It is an arithmetic number, because the mean of its divisors is an integer number (18338888511).

Almost surely, 2^36677777021 is an apocalyptic number.

It is an amenable number.

36677777021 is a deficient number, since it is larger than the sum of its proper divisors (1).

36677777021 is an equidigital number, since it uses as much as digits as its factorization.

36677777021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3630312, while the sum is 53.

The spelling of 36677777021 in words is "thirty-six billion, six hundred seventy-seven million, seven hundred seventy-seven thousand, twenty-one".