21001113311023 has 4 divisors (see below), whose sum is σ = 21005487636448. Its totient is φ = 20996738985600.

The previous prime is 21001113310987. The next prime is 21001113311083. The reversal of 21001113311023 is 32011331110012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21001113311023 - 2⁴¹ = 18802090055471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001113311083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2187155511 + ... + 2187165112.

It is an arithmetic number, because the mean of its divisors is an integer number (5251371909112).

Almost surely, 2^{21001113311023} is an apocalyptic number.

21001113311023 is a deficient number, since it is larger than the sum of its proper divisors (4374325425).

21001113311023 is an equidigital number, since it uses as much as digits as its factorization.

21001113311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374325424.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 21001113311023 its reverse (32011331110012), we get a palindrome (53012444421035).

The spelling of 21001113311023 in words is "twenty-one trillion, one billion, one hundred thirteen million, three hundred eleven thousand, twenty-three".