21203033103 has 48 divisors (see below), whose sum is σ = 35439543360. Its totient is φ = 11964851712.

The previous prime is 21203033003. The next prime is 21203033107. The reversal of 21203033103 is 30133030212.

It is not a de Polignac number, because 21203033103 - 2¹⁰ = 21203032079 is a prime.

It is a super-2 number, since 2×21203033103² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203033107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5678025 + ... + 5681757.

It is an arithmetic number, because the mean of its divisors is an integer number (738323820).

Almost surely, 2^21203033103 is an apocalyptic number.

21203033103 is a deficient number, since it is larger than the sum of its proper divisors (14236510257).

21203033103 is a wasteful number, since it uses less digits than its factorization.

21203033103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848 (or 4845 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21203033103 its reverse (30133030212), we get a palindrome (51336063315).

The spelling of 21203033103 in words is "twenty-one billion, two hundred three million, thirty-three thousand, one hundred three".