21536271049 has 2 divisors, whose sum is σ = 21536271050. Its totient is φ = 21536271048.

The previous prime is 21536271017. The next prime is 21536271079. The reversal of 21536271049 is 94017263512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21473971600 + 62299449 = 146540^2 + 7893^2 .

It is a cyclic number.

It is not a de Polignac number, because 21536271049 - 2⁵ = 21536271017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536271079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768135524 + 10768135525.

It is an arithmetic number, because the mean of its divisors is an integer number (10768135525).

Almost surely, 2^21536271049 is an apocalyptic number.

It is an amenable number.

21536271049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536271049 is an equidigital number, since it uses as much as digits as its factorization.

21536271049 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 40.

The spelling of 21536271049 in words is "twenty-one billion, five hundred thirty-six million, two hundred seventy-one thousand, forty-nine".