21300879473 has 2 divisors, whose sum is σ = 21300879474. Its totient is φ = 21300879472.

The previous prime is 21300879469. The next prime is 21300879529. The reversal of 21300879473 is 37497800312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21294689329 + 6190144 = 145927^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300879473 - 2² = 21300879469 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300879463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650439736 + 10650439737.

It is an arithmetic number, because the mean of its divisors is an integer number (10650439737).

Almost surely, 2^21300879473 is an apocalyptic number.

It is an amenable number.

21300879473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300879473 is an equidigital number, since it uses as much as digits as its factorization.

21300879473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21300879473 in words is "twenty-one billion, three hundred million, eight hundred seventy-nine thousand, four hundred seventy-three".