21111021010979 has 2 divisors, whose sum is σ = 21111021010980. Its totient is φ = 21111021010978.

The previous prime is 21111021010969. The next prime is 21111021010987. The reversal of 21111021010979 is 97901012011112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111021010979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111021010969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555510505489 + 10555510505490.

It is an arithmetic number, because the mean of its divisors is an integer number (10555510505490).

Almost surely, 2^{21111021010979} is an apocalyptic number.

21111021010979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111021010979 is an equidigital number, since it uses as much as digits as its factorization.

21111021010979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 35.

The spelling of 21111021010979 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, ten thousand, nine hundred seventy-nine".