21103311023 has 8 divisors (see below), whose sum is σ = 21652312416. Its totient is φ = 20555942400.

The previous prime is 21103310993. The next prime is 21103311041. The reversal of 21103311023 is 32011330112.

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 21103311023 - 2¹⁰ = 21103309999 is a prime.

It is a super-2 number, since 2×21103311023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103310992 and 21103311010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103361023) 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, 381986 + ... + 433727.

It is an arithmetic number, because the mean of its divisors is an integer number (2706539052).

Almost surely, 2^21103311023 is an apocalyptic number.

21103311023 is a deficient number, since it is larger than the sum of its proper divisors (549001393).

21103311023 is an equidigital number, since it uses as much as digits as its factorization.

21103311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816385.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21103311023 its reverse (32011330112), we get a palindrome (53114641135).

It can be divided in two parts, 2110 and 3311023, that added together give a palindrome (3313133).

The spelling of 21103311023 in words is "twenty-one billion, one hundred three million, three hundred eleven thousand, twenty-three".