21010200979 has 2 divisors, whose sum is σ = 21010200980. Its totient is φ = 21010200978.

The previous prime is 21010200929. The next prime is 21010200983. The reversal of 21010200979 is 97900201012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010200979 - 2¹³ = 21010192787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010200979.

It is not a weakly prime, because it can be changed into another prime (21010200919) 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, 10505100489 + 10505100490.

It is an arithmetic number, because the mean of its divisors is an integer number (10505100490).

Almost surely, 2^21010200979 is an apocalyptic number.

21010200979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010200979 is an equidigital number, since it uses as much as digits as its factorization.

21010200979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The spelling of 21010200979 in words is "twenty-one billion, ten million, two hundred thousand, nine hundred seventy-nine".