20200121201971 has 2 divisors, whose sum is σ = 20200121201972. Its totient is φ = 20200121201970.

The previous prime is 20200121201963. The next prime is 20200121202017. The reversal of 20200121201971 is 17910212100202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20200121201971 - 2³ = 20200121201963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20200121201941) 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, 10100060600985 + 10100060600986.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060600986).

Almost surely, 2^{20200121201971} is an apocalyptic number.

20200121201971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200121201971 is an equidigital number, since it uses as much as digits as its factorization.

20200121201971 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 20200121201971 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two hundred one thousand, nine hundred seventy-one".