21300879641 has 2 divisors, whose sum is σ = 21300879642. Its totient is φ = 21300879640.

The previous prime is 21300879637. The next prime is 21300879673. The reversal of 21300879641 is 14697800312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13358505241 + 7942374400 = 115579^2 + 89120^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300879641 - 2² = 21300879637 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300872641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650439820 + 10650439821.

It is an arithmetic number, because the mean of its divisors is an integer number (10650439821).

Almost surely, 2^21300879641 is an apocalyptic number.

It is an amenable number.

21300879641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300879641 is an equidigital number, since it uses as much as digits as its factorization.

21300879641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21300879641 in words is "twenty-one billion, three hundred million, eight hundred seventy-nine thousand, six hundred forty-one".