21765060803 has 2 divisors, whose sum is σ = 21765060804. Its totient is φ = 21765060802.

The previous prime is 21765060799. The next prime is 21765060829. The reversal of 21765060803 is 30806056712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21765060803 - 2² = 21765060799 is a prime.

It is not a weakly prime, because it can be changed into another prime (21765060853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10882530401 + 10882530402.

It is an arithmetic number, because the mean of its divisors is an integer number (10882530402).

Almost surely, 2^21765060803 is an apocalyptic number.

21765060803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21765060803 is an equidigital number, since it uses as much as digits as its factorization.

21765060803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21765060803 in words is "twenty-one billion, seven hundred sixty-five million, sixty thousand, eight hundred three".