21103011001 has 16 divisors (see below), whose sum is σ = 21381247888. Its totient is φ = 20827238400.

The previous prime is 21103010989. The next prime is 21103011011. The reversal of 21103011001 is 10011030112.

It can be written as a sum of positive squares in 8 ways, for example, as 666878976 + 20436132025 = 25824^2 + 142955^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103011001 - 2⁵ = 21103010969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103011011) 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 15 ways as a sum of consecutive naturals, for example, 16269985 + ... + 16271281.

It is an arithmetic number, because the mean of its divisors is an integer number (1336327993).

Almost surely, 2^21103011001 is an apocalyptic number.

It is an amenable number.

21103011001 is a deficient number, since it is larger than the sum of its proper divisors (278236887).

21103011001 is a wasteful number, since it uses less digits than its factorization.

21103011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21103011001 its reverse (10011030112), we get a palindrome (31114041113).

The spelling of 21103011001 in words is "twenty-one billion, one hundred three million, eleven thousand, one".