21121020020101 has 16 divisors (see below), whose sum is σ = 21606100289280. Its totient is φ = 20637441420480.

The previous prime is 21121020020033. The next prime is 21121020020161. The reversal of 21121020020101 is 10102002012112.

It is a cyclic number.

It is not a de Polignac number, because 21121020020101 - 2¹¹ = 21121020018053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121020020161) 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 in 15 ways as a sum of consecutive naturals, for example, 140247895 + ... + 140398411.

It is an arithmetic number, because the mean of its divisors is an integer number (1350381268080).

Almost surely, 2^{21121020020101} is an apocalyptic number.

It is an amenable number.

21121020020101 is a deficient number, since it is larger than the sum of its proper divisors (485080269179).

21121020020101 is a wasteful number, since it uses less digits than its factorization.

21121020020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155484.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21121020020101 its reverse (10102002012112), we get a palindrome (31223022032213).

The spelling of 21121020020101 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, twenty thousand, one hundred one".