20320420121501 has 2 divisors, whose sum is σ = 20320420121502. Its totient is φ = 20320420121500.

The previous prime is 20320420121471. The next prime is 20320420121591. The reversal of 20320420121501 is 10512102402302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13073098474276 + 7247321647225 = 3615674^2 + 2692085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320420121501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320420121591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160210060750 + 10160210060751.

It is an arithmetic number, because the mean of its divisors is an integer number (10160210060751).

Almost surely, 2^{20320420121501} is an apocalyptic number.

It is an amenable number.

20320420121501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320420121501 is an equidigital number, since it uses as much as digits as its factorization.

20320420121501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20320420121501 its reverse (10512102402302), we get a palindrome (30832522523803).

The spelling of 20320420121501 in words is "twenty trillion, three hundred twenty billion, four hundred twenty million, one hundred twenty-one thousand, five hundred one".