21041002023 has 4 divisors (see below), whose sum is σ = 28054669368. Its totient is φ = 14027334680.

The previous prime is 21041002009. The next prime is 21041002039. The reversal of 21041002023 is 32020014012.

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 21041002023 - 2⁴ = 21041002007 is a prime.

It is a super-2 number, since 2×21041002023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21041001993 and 21041002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041002223) 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, 3506833668 + ... + 3506833673.

It is an arithmetic number, because the mean of its divisors is an integer number (7013667342).

Almost surely, 2^21041002023 is an apocalyptic number.

21041002023 is a deficient number, since it is larger than the sum of its proper divisors (7013667345).

21041002023 is an equidigital number, since it uses as much as digits as its factorization.

21041002023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013667344.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21041002023 its reverse (32020014012), we get a palindrome (53061016035).

The spelling of 21041002023 in words is "twenty-one billion, forty-one million, two thousand, twenty-three".