21101201003 has 16 divisors (see below), whose sum is σ = 21456543744. Its totient is φ = 20749478400.

The previous prime is 21101200997. The next prime is 21101201039. The reversal of 21101201003 is 30010210112.

It is a cyclic number.

It is not a de Polignac number, because 21101201003 - 2³⁴ = 3921331819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101201503) 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, 11064176 + ... + 11066082.

It is an arithmetic number, because the mean of its divisors is an integer number (1341033984).

Almost surely, 2^21101201003 is an apocalyptic number.

21101201003 is a deficient number, since it is larger than the sum of its proper divisors (355342741).

21101201003 is a wasteful number, since it uses less digits than its factorization.

21101201003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21101201003 its reverse (30010210112), we get a palindrome (51111411115).

The spelling of 21101201003 in words is "twenty-one billion, one hundred one million, two hundred one thousand, three".