21111011003 has 8 divisors (see below), whose sum is σ = 21266708400. Its totient is φ = 20955368448.

The previous prime is 21111010981. The next prime is 21111011021. The reversal of 21111011003 is 30011011112.

It is a happy number.

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 21111011003 - 2⁸ = 21111010747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111011023) 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 7 ways as a sum of consecutive naturals, for example, 1073483 + ... + 1092971.

It is an arithmetic number, because the mean of its divisors is an integer number (2658338550).

Almost surely, 2^21111011003 is an apocalyptic number.

21111011003 is a deficient number, since it is larger than the sum of its proper divisors (155697397).

21111011003 is a wasteful number, since it uses less digits than its factorization.

21111011003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27421.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21111011003 its reverse (30011011112), we get a palindrome (51122022115).

The spelling of 21111011003 in words is "twenty-one billion, one hundred eleven million, eleven thousand, three".