21256030411079 has 2 divisors, whose sum is σ = 21256030411080. Its totient is φ = 21256030411078.

The previous prime is 21256030411027. The next prime is 21256030411087. The reversal of 21256030411079 is 97011403065212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21256030411079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21256030411579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10628015205539 + 10628015205540.

It is an arithmetic number, because the mean of its divisors is an integer number (10628015205540).

Almost surely, 2^{21256030411079} is an apocalyptic number.

21256030411079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21256030411079 is an equidigital number, since it uses as much as digits as its factorization.

21256030411079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21256030411079 in words is "twenty-one trillion, two hundred fifty-six billion, thirty million, four hundred eleven thousand, seventy-nine".