202120321397 has 2 divisors, whose sum is σ = 202120321398. Its totient is φ = 202120321396.

The previous prime is 202120321391. The next prime is 202120321411. The reversal of 202120321397 is 793123021202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169448312881 + 32672008516 = 411641^2 + 180754^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120321397 - 2¹⁰ = 202120320373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202120321391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060160698 + 101060160699.

It is an arithmetic number, because the mean of its divisors is an integer number (101060160699).

Almost surely, 2^202120321397 is an apocalyptic number.

It is an amenable number.

202120321397 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120321397 is an equidigital number, since it uses as much as digits as its factorization.

202120321397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

Adding to 202120321397 its reverse (793123021202), we get a palindrome (995243342599).

The spelling of 202120321397 in words is "two hundred two billion, one hundred twenty million, three hundred twenty-one thousand, three hundred ninety-seven".