21101011003 has 16 divisors (see below), whose sum is σ = 22136970240. Its totient is φ = 20075181984.

The previous prime is 21101010977. The next prime is 21101011033. The reversal of 21101011003 is 30011010112.

It is a cyclic number.

It is not a de Polignac number, because 21101011003 - 2⁵ = 21101010971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101011033) 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, 4431538 + ... + 4436296.

It is an arithmetic number, because the mean of its divisors is an integer number (1383560640).

Almost surely, 2^21101011003 is an apocalyptic number.

21101011003 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21101011003 is a deficient number, since it is larger than the sum of its proper divisors (1035959237).

21101011003 is a wasteful number, since it uses less digits than its factorization.

21101011003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778.

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

Adding to 21101011003 its reverse (30011010112), we get a palindrome (51112021115).

The spelling of 21101011003 in words is "twenty-one billion, one hundred one million, eleven thousand, three".