2020212101981 has 2 divisors, whose sum is σ = 2020212101982. Its totient is φ = 2020212101980.

The previous prime is 2020212101933. The next prime is 2020212102047. The reversal of 2020212101981 is 1891012120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1992871479481 + 27340622500 = 1411691^2 + 165350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2020212101981 is a prime.

It is a super-2 number, since 2×2020212101981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020212101911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010106050990 + 1010106050991.

It is an arithmetic number, because the mean of its divisors is an integer number (1010106050991).

Almost surely, 2^{2020212101981} is an apocalyptic number.

It is an amenable number.

2020212101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020212101981 is an equidigital number, since it uses as much as digits as its factorization.

2020212101981 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 29.

The spelling of 2020212101981 in words is "two trillion, twenty billion, two hundred twelve million, one hundred one thousand, nine hundred eighty-one".