20201100012721 has 2 divisors, whose sum is σ = 20201100012722. Its totient is φ = 20201100012720.

The previous prime is 20201100012683. The next prime is 20201100012763. The reversal of 20201100012721 is 12721000110202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17529964134400 + 2671135878321 = 4186880^2 + 1634361^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201100012721 - 2¹³ = 20201100004529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201100019721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100550006360 + 10100550006361.

It is an arithmetic number, because the mean of its divisors is an integer number (10100550006361).

Almost surely, 2^{20201100012721} is an apocalyptic number.

It is an amenable number.

20201100012721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201100012721 is an equidigital number, since it uses as much as digits as its factorization.

20201100012721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20201100012721 its reverse (12721000110202), we get a palindrome (32922100122923).

The spelling of 20201100012721 in words is "twenty trillion, two hundred one billion, one hundred million, twelve thousand, seven hundred twenty-one".