21326560049 has 2 divisors, whose sum is σ = 21326560050. Its totient is φ = 21326560048.

The previous prime is 21326560039. The next prime is 21326560069. The reversal of 21326560049 is 94006562312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20410408225 + 916151824 = 142865^2 + 30268^2 .

It is a cyclic number.

It is not a de Polignac number, because 21326560049 - 2⁴ = 21326560033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21326559994 and 21326560021.

It is not a weakly prime, because it can be changed into another prime (21326560039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663280024 + 10663280025.

It is an arithmetic number, because the mean of its divisors is an integer number (10663280025).

Almost surely, 2^21326560049 is an apocalyptic number.

It is an amenable number.

21326560049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326560049 is an equidigital number, since it uses as much as digits as its factorization.

21326560049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21326560049 in words is "twenty-one billion, three hundred twenty-six million, five hundred sixty thousand, forty-nine".