21083136977 has 8 divisors (see below), whose sum is σ = 24107011392. Its totient is φ = 18062262000.

The previous prime is 21083136923. The next prime is 21083136989. The reversal of 21083136977 is 77963138012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21083136977 - 2⁶ = 21083136913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21083136377) 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 7 ways as a sum of consecutive naturals, for example, 734774 + ... + 762927.

It is an arithmetic number, because the mean of its divisors is an integer number (3013376424).

Almost surely, 2^21083136977 is an apocalyptic number.

It is an amenable number.

21083136977 is a deficient number, since it is larger than the sum of its proper divisors (3023874415).

21083136977 is a wasteful number, since it uses less digits than its factorization.

21083136977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499719.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 21083136977 in words is "twenty-one billion, eighty-three million, one hundred thirty-six thousand, nine hundred seventy-seven".