21103011020101 has 12 divisors (see below), whose sum is σ = 22005765259500. Its totient is φ = 20234908365120.

The previous prime is 21103011020053. The next prime is 21103011020129. The reversal of 21103011020101 is 10102011030112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7869960569025 + 13233050451076 = 2805345^2 + 3637726^2 .

It is not a de Polignac number, because 21103011020101 - 2²⁹ = 21102474149189 is a prime.

It is a super-2 number, since 2×21103011020101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103011620101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100626576 + ... + 100836073.

It is an arithmetic number, because the mean of its divisors is an integer number (1833813771625).

Almost surely, 2^{21103011020101} is an apocalyptic number.

It is an amenable number.

21103011020101 is a deficient number, since it is larger than the sum of its proper divisors (902754239399).

21103011020101 is a wasteful number, since it uses less digits than its factorization.

21103011020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201462820 (or 201462789 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21103011020101 its reverse (10102011030112), we get a palindrome (31205022050213).

The spelling of 21103011020101 in words is "twenty-one trillion, one hundred three billion, eleven million, twenty thousand, one hundred one".