20210121201211 has 2 divisors, whose sum is σ = 20210121201212. Its totient is φ = 20210121201210.

The previous prime is 20210121201191. The next prime is 20210121201287. The reversal of 20210121201211 is 11210212101202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20210121201211 - 2¹⁹ = 20210120676923 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210121201311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105060600605 + 10105060600606.

It is an arithmetic number, because the mean of its divisors is an integer number (10105060600606).

Almost surely, 2^{20210121201211} is an apocalyptic number.

20210121201211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210121201211 is an equidigital number, since it uses as much as digits as its factorization.

20210121201211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20210121201211 its reverse (11210212101202), we get a palindrome (31420333302413).

It can be divided in two parts, 2021012 and 1201211, that added together give a palindrome (3222223).

The spelling of 20210121201211 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".