21003001103 has 8 divisors (see below), whose sum is σ = 25047057408. Its totient is φ = 17219851704.

The previous prime is 21003001087. The next prime is 21003001121. The reversal of 21003001103 is 30110030012.

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 21003001103 - 2⁴ = 21003001087 is a prime.

It is a super-2 number, since 2×21003001103² (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 (21003001133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65226551 + ... + 65226872.

It is an arithmetic number, because the mean of its divisors is an integer number (3130882176).

Almost surely, 2^21003001103 is an apocalyptic number.

21003001103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21003001103 is a deficient number, since it is larger than the sum of its proper divisors (4044056305).

21003001103 is a wasteful number, since it uses less digits than its factorization.

21003001103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130453453.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21003001103 its reverse (30110030012), we get a palindrome (51113031115).

The spelling of 21003001103 in words is "twenty-one billion, three million, one thousand, one hundred three".