21012110103 has 8 divisors (see below), whose sum is σ = 28104527088. Its totient is φ = 13963883264.

The previous prime is 21012110059. The next prime is 21012110111. The reversal of 21012110103 is 30101121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012110103 - 2¹³ = 21012101911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012118103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11046426 + ... + 11048327.

It is an arithmetic number, because the mean of its divisors is an integer number (3513065886).

Almost surely, 2^21012110103 is an apocalyptic number.

21012110103 is a deficient number, since it is larger than the sum of its proper divisors (7092416985).

21012110103 is a wasteful number, since it uses less digits than its factorization.

21012110103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22095073.

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

Adding to 21012110103 its reverse (30101121012), we get a palindrome (51113231115).

The spelling of 21012110103 in words is "twenty-one billion, twelve million, one hundred ten thousand, one hundred three".