20921588383 has 4 divisors (see below), whose sum is σ = 20952220968. Its totient is φ = 20890955800.

The previous prime is 20921588377. The next prime is 20921588411. The reversal of 20921588383 is 38388512902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20921588383 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 (20921588323) 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 in 3 ways as a sum of consecutive naturals, for example, 15315268 + ... + 15316633.

It is an arithmetic number, because the mean of its divisors is an integer number (5238055242).

Almost surely, 2^20921588383 is an apocalyptic number.

20921588383 is a deficient number, since it is larger than the sum of its proper divisors (30632585).

20921588383 is an equidigital number, since it uses as much as digits as its factorization.

20921588383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632584.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 20921588383 in words is "twenty billion, nine hundred twenty-one million, five hundred eighty-eight thousand, three hundred eighty-three".