21003110879 has 2 divisors, whose sum is σ = 21003110880. Its totient is φ = 21003110878.

The previous prime is 21003110867. The next prime is 21003110911. The reversal of 21003110879 is 97801130012.

It is an a-pointer prime, because the next prime (21003110911) can be obtained adding 21003110879 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003110879 - 2³² = 16708143583 is a prime.

It is a super-2 number, since 2×21003110879² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003110809) 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 as a sum of consecutive naturals, namely, 10501555439 + 10501555440.

It is an arithmetic number, because the mean of its divisors is an integer number (10501555440).

Almost surely, 2^21003110879 is an apocalyptic number.

21003110879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003110879 is an equidigital number, since it uses as much as digits as its factorization.

21003110879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 21003110879 in words is "twenty-one billion, three million, one hundred ten thousand, eight hundred seventy-nine".