21182636077 has 16 divisors (see below), whose sum is σ = 22643712000. Its totient is φ = 19756986480.

The previous prime is 21182636053. The next prime is 21182636143. The reversal of 21182636077 is 77063628112.

It is a cyclic number.

It is not a de Polignac number, because 21182636077 - 2¹¹ = 21182634029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21182636017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969924 + ... + 991522.

It is an arithmetic number, because the mean of its divisors is an integer number (1415232000).

Almost surely, 2^21182636077 is an apocalyptic number.

It is an amenable number.

21182636077 is a deficient number, since it is larger than the sum of its proper divisors (1461075923).

21182636077 is a wasteful number, since it uses less digits than its factorization.

21182636077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22416.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 21182636077 in words is "twenty-one billion, one hundred eighty-two million, six hundred thirty-six thousand, seventy-seven".