21320120201 has 2 divisors, whose sum is σ = 21320120202. Its totient is φ = 21320120200.

The previous prime is 21320120177. The next prime is 21320120209. The reversal of 21320120201 is 10202102312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21301110601 + 19009600 = 145949^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320120201 - 2⁶ = 21320120137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320120209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660060100 + 10660060101.

It is an arithmetic number, because the mean of its divisors is an integer number (10660060101).

Almost surely, 2^21320120201 is an apocalyptic number.

It is an amenable number.

21320120201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320120201 is an equidigital number, since it uses as much as digits as its factorization.

21320120201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21320120201 its reverse (10202102312), we get a palindrome (31522222513).

The spelling of 21320120201 in words is "twenty-one billion, three hundred twenty million, one hundred twenty thousand, two hundred one".