20073599435621 has 2 divisors, whose sum is σ = 20073599435622. Its totient is φ = 20073599435620.

The previous prime is 20073599435609. The next prime is 20073599435741. The reversal of 20073599435621 is 12653499537002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14732462447521 + 5341136988100 = 3838289^2 + 2311090^2 .

It is a cyclic number.

It is not a de Polignac number, because 20073599435621 - 2²² = 20073595241317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20073599435221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036799717810 + 10036799717811.

It is an arithmetic number, because the mean of its divisors is an integer number (10036799717811).

Almost surely, 2^{20073599435621} is an apocalyptic number.

It is an amenable number.

20073599435621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20073599435621 is an equidigital number, since it uses as much as digits as its factorization.

20073599435621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 56.

The spelling of 20073599435621 in words is "twenty trillion, seventy-three billion, five hundred ninety-nine million, four hundred thirty-five thousand, six hundred twenty-one".