20321045497 has 2 divisors, whose sum is σ = 20321045498. Its totient is φ = 20321045496.

The previous prime is 20321045467. The next prime is 20321045501. The reversal of 20321045497 is 79454012302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15094333881 + 5226711616 = 122859^2 + 72296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321045497 - 2¹⁵ = 20321012729 is a prime.

It is a super-2 number, since 2×20321045497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321045467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160522748 + 10160522749.

It is an arithmetic number, because the mean of its divisors is an integer number (10160522749).

Almost surely, 2^20321045497 is an apocalyptic number.

It is an amenable number.

20321045497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321045497 is an equidigital number, since it uses as much as digits as its factorization.

20321045497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 20321045497 its reverse (79454012302), we get a palindrome (99775057799).

The spelling of 20321045497 in words is "twenty billion, three hundred twenty-one million, forty-five thousand, four hundred ninety-seven".