21002102122103 has 2 divisors, whose sum is σ = 21002102122104. Its totient is φ = 21002102122102.

The previous prime is 21002102122097. The next prime is 21002102122117. The reversal of 21002102122103 is 30122120120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002102122103 - 2¹⁰ = 21002102121079 is a prime.

It is a super-2 number, since 2×21002102122103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002102122153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501051061051 + 10501051061052.

It is an arithmetic number, because the mean of its divisors is an integer number (10501051061052).

Almost surely, 2^{21002102122103} is an apocalyptic number.

21002102122103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002102122103 is an equidigital number, since it uses as much as digits as its factorization.

21002102122103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002102122103 its reverse (30122120120012), we get a palindrome (51124222242115).

The spelling of 21002102122103 in words is "twenty-one trillion, two billion, one hundred two million, one hundred twenty-two thousand, one hundred three".