20101021103 has 2 divisors, whose sum is σ = 20101021104. Its totient is φ = 20101021102.

The previous prime is 20101021099. The next prime is 20101021181. The reversal of 20101021103 is 30112010102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20101021103 - 2² = 20101021099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101021903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050510551 + 10050510552.

It is an arithmetic number, because the mean of its divisors is an integer number (10050510552).

Almost surely, 2^20101021103 is an apocalyptic number.

20101021103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101021103 is an equidigital number, since it uses as much as digits as its factorization.

20101021103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20101021103 its reverse (30112010102), we get a palindrome (50213031205).

The spelling of 20101021103 in words is "twenty billion, one hundred one million, twenty-one thousand, one hundred three".