20213120032081 has 2 divisors, whose sum is σ = 20213120032082. Its totient is φ = 20213120032080.

The previous prime is 20213120032013. The next prime is 20213120032103. The reversal of 20213120032081 is 18023002131202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13815048259600 + 6398071772481 = 3716860^2 + 2529441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213120032081 - 2⁹ = 20213120031569 is a prime.

It is a super-2 number, since 2×20213120032081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20213120012081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106560016040 + 10106560016041.

It is an arithmetic number, because the mean of its divisors is an integer number (10106560016041).

Almost surely, 2^{20213120032081} is an apocalyptic number.

It is an amenable number.

20213120032081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213120032081 is an equidigital number, since it uses as much as digits as its factorization.

20213120032081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 20213120032081 its reverse (18023002131202), we get a palindrome (38236122163283).

The spelling of 20213120032081 in words is "twenty trillion, two hundred thirteen billion, one hundred twenty million, thirty-two thousand, eighty-one".