21165001233103 has 24 divisors (see below), whose sum is σ = 26208763253088. Its totient is φ = 16735447677312.

The previous prime is 21165001233017. The next prime is 21165001233139. The reversal of 21165001233103 is 30133210056112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21165001233103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165001233703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3712176 + ... + 7490677.

It is an arithmetic number, because the mean of its divisors is an integer number (1092031802212).

Almost surely, 2^{21165001233103} is an apocalyptic number.

21165001233103 is a deficient number, since it is larger than the sum of its proper divisors (5043762019985).

21165001233103 is a wasteful number, since it uses less digits than its factorization.

21165001233103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11204483 (or 11204470 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

Adding to 21165001233103 its reverse (30133210056112), we get a palindrome (51298211289215).

The spelling of 21165001233103 in words is "twenty-one trillion, one hundred sixty-five billion, one million, two hundred thirty-three thousand, one hundred three".