21101464251089 has 2 divisors, whose sum is σ = 21101464251090. Its totient is φ = 21101464251088.

The previous prime is 21101464251061. The next prime is 21101464251149. The reversal of 21101464251089 is 98015246410112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13269117582400 + 7832346668689 = 3642680^2 + 2798633^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101464251089 - 2²⁰ = 21101463202513 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101464251059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550732125544 + 10550732125545.

It is an arithmetic number, because the mean of its divisors is an integer number (10550732125545).

Almost surely, 2^{21101464251089} is an apocalyptic number.

It is an amenable number.

21101464251089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101464251089 is an equidigital number, since it uses as much as digits as its factorization.

21101464251089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 21101464251089 in words is "twenty-one trillion, one hundred one billion, four hundred sixty-four million, two hundred fifty-one thousand, eighty-nine".