21571352753 has 2 divisors, whose sum is σ = 21571352754. Its totient is φ = 21571352752.

The previous prime is 21571352653. The next prime is 21571352773. The reversal of 21571352753 is 35725317512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18097782784 + 3473569969 = 134528^2 + 58937^2 .

It is a cyclic number.

It is not a de Polignac number, because 21571352753 - 2⁸ = 21571352497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21571352753.

It is not a weakly prime, because it can be changed into another prime (21571352773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10785676376 + 10785676377.

It is an arithmetic number, because the mean of its divisors is an integer number (10785676377).

Almost surely, 2^21571352753 is an apocalyptic number.

It is an amenable number.

21571352753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21571352753 is an equidigital number, since it uses as much as digits as its factorization.

21571352753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220500, while the sum is 41.

The spelling of 21571352753 in words is "twenty-one billion, five hundred seventy-one million, three hundred fifty-two thousand, seven hundred fifty-three".