21012020020141 has 2 divisors, whose sum is σ = 21012020020142. Its totient is φ = 21012020020140.

The previous prime is 21012020020133. The next prime is 21012020020331. The reversal of 21012020020141 is 14102002021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19769361375625 + 1242658644516 = 4446275^2 + 1114746^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012020020141 - 2³ = 21012020020133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012020020841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506010010070 + 10506010010071.

It is an arithmetic number, because the mean of its divisors is an integer number (10506010010071).

Almost surely, 2^{21012020020141} is an apocalyptic number.

It is an amenable number.

21012020020141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012020020141 is an equidigital number, since it uses as much as digits as its factorization.

21012020020141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012020020141 its reverse (14102002021012), we get a palindrome (35114022041153).

The spelling of 21012020020141 in words is "twenty-one trillion, twelve billion, twenty million, twenty thousand, one hundred forty-one".