21500121330593 has 2 divisors, whose sum is σ = 21500121330594. Its totient is φ = 21500121330592.

The previous prime is 21500121330533. The next prime is 21500121330671. The reversal of 21500121330593 is 39503312100512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16305993172624 + 5194128157969 = 4038068^2 + 2279063^2 .

It is a cyclic number.

It is not a de Polignac number, because 21500121330593 - 2¹⁴ = 21500121314209 is a prime.

It is a super-2 number, since 2×21500121330593² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21500121330533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750060665296 + 10750060665297.

It is an arithmetic number, because the mean of its divisors is an integer number (10750060665297).

Almost surely, 2^{21500121330593} is an apocalyptic number.

It is an amenable number.

21500121330593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21500121330593 is an equidigital number, since it uses as much as digits as its factorization.

21500121330593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The spelling of 21500121330593 in words is "twenty-one trillion, five hundred billion, one hundred twenty-one million, three hundred thirty thousand, five hundred ninety-three".