21110121023 has 8 divisors (see below), whose sum is σ = 21260288880. Its totient is φ = 20960311680.

The previous prime is 21110121013. The next prime is 21110121029. The reversal of 21110121023 is 32012101112.

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 21110121023 - 2¹⁰ = 21110119999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110120989 and 21110121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121029) 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, 29111 + ... + 207527.

It is an arithmetic number, because the mean of its divisors is an integer number (2657536110).

Almost surely, 2^21110121023 is an apocalyptic number.

21110121023 is a deficient number, since it is larger than the sum of its proper divisors (150167857).

21110121023 is a wasteful number, since it uses less digits than its factorization.

21110121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179257.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21110121023 its reverse (32012101112), we get a palindrome (53122222135).

The spelling of 21110121023 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, twenty-three".