21011012123103 has 16 divisors (see below), whose sum is σ = 31127617128960. Its totient is φ = 14007255122808.

The previous prime is 21011012123069. The next prime is 21011012123119. The reversal of 21011012123103 is 30132121011012.

It is not a de Polignac number, because 21011012123103 - 2⁸ = 21011012122847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011012123503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2229226 + ... + 6855032.

It is an arithmetic number, because the mean of its divisors is an integer number (1945476070560).

Almost surely, 2^{21011012123103} is an apocalyptic number.

21011012123103 is a deficient number, since it is larger than the sum of its proper divisors (10116605005857).

21011012123103 is a wasteful number, since it uses less digits than its factorization.

21011012123103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4794043 (or 4794037 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21011012123103 its reverse (30132121011012), we get a palindrome (51143133134115).

The spelling of 21011012123103 in words is "twenty-one trillion, eleven billion, twelve million, one hundred twenty-three thousand, one hundred three".