21365161337753 has 2 divisors, whose sum is σ = 21365161337754. Its totient is φ = 21365161337752.

The previous prime is 21365161337743. The next prime is 21365161337771. The reversal of 21365161337753 is 35773316156312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15993024760384 + 5372136577369 = 3999128^2 + 2317787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21365161337753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21365161337695 and 21365161337704.

It is not a weakly prime, because it can be changed into another prime (21365161337743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682580668876 + 10682580668877.

It is an arithmetic number, because the mean of its divisors is an integer number (10682580668877).

Almost surely, 2^{21365161337753} is an apocalyptic number.

It is an amenable number.

21365161337753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21365161337753 is an equidigital number, since it uses as much as digits as its factorization.

21365161337753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7144200, while the sum is 53.

The spelling of 21365161337753 in words is "twenty-one trillion, three hundred sixty-five billion, one hundred sixty-one million, three hundred thirty-seven thousand, seven hundred fifty-three".