20001021210103 has 2 divisors, whose sum is σ = 20001021210104. Its totient is φ = 20001021210102.

The previous prime is 20001021210097. The next prime is 20001021210127. The reversal of 20001021210103 is 30101212010002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001021210103 - 2³³ = 19992431275511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001021210193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000510605051 + 10000510605052.

It is an arithmetic number, because the mean of its divisors is an integer number (10000510605052).

Almost surely, 2^{20001021210103} is an apocalyptic number.

20001021210103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001021210103 is an equidigital number, since it uses as much as digits as its factorization.

20001021210103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20001021210103 its reverse (30101212010002), we get a palindrome (50102233220105).

The spelling of 20001021210103 in words is "twenty trillion, one billion, twenty-one million, two hundred ten thousand, one hundred three".