21041013979 has 2 divisors, whose sum is σ = 21041013980. Its totient is φ = 21041013978.

The previous prime is 21041013949. The next prime is 21041014013. The reversal of 21041013979 is 97931014012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041013979 - 2⁵ = 21041013947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041013949) 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 as a sum of consecutive naturals, namely, 10520506989 + 10520506990.

It is an arithmetic number, because the mean of its divisors is an integer number (10520506990).

Almost surely, 2^21041013979 is an apocalyptic number.

21041013979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041013979 is an equidigital number, since it uses as much as digits as its factorization.

21041013979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 21041013979 in words is "twenty-one billion, forty-one million, thirteen thousand, nine hundred seventy-nine".