20201021210971 has 2 divisors, whose sum is σ = 20201021210972. Its totient is φ = 20201021210970.

The previous prime is 20201021210963. The next prime is 20201021211017. The reversal of 20201021210971 is 17901212010202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201021210971 - 2³ = 20201021210963 is a prime.

It is a super-2 number, since 2×20201021210971² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20201021210911) 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, 10100510605485 + 10100510605486.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510605486).

Almost surely, 2^{20201021210971} is an apocalyptic number.

20201021210971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201021210971 is an equidigital number, since it uses as much as digits as its factorization.

20201021210971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 20201021210971 in words is "twenty trillion, two hundred one billion, twenty-one million, two hundred ten thousand, nine hundred seventy-one".