21529053593 has 2 divisors, whose sum is σ = 21529053594. Its totient is φ = 21529053592.

The previous prime is 21529053583. The next prime is 21529053599. The reversal of 21529053593 is 39535092512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19447139209 + 2081914384 = 139453^2 + 45628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21529053593 - 2³² = 17234086297 is a prime.

It is a super-2 number, since 2×21529053593² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21529053599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10764526796 + 10764526797.

It is an arithmetic number, because the mean of its divisors is an integer number (10764526797).

Almost surely, 2^21529053593 is an apocalyptic number.

It is an amenable number.

21529053593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21529053593 is an equidigital number, since it uses as much as digits as its factorization.

21529053593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 364500, while the sum is 44.

The spelling of 21529053593 in words is "twenty-one billion, five hundred twenty-nine million, fifty-three thousand, five hundred ninety-three".