21241311023 has 4 divisors (see below), whose sum is σ = 21242671968. Its totient is φ = 21239950080.

The previous prime is 21241310969. The next prime is 21241311053. The reversal of 21241311023 is 32011314212.

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 21241311023 - 2⁸ = 21241310767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21241310986 and 21241311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241311053) 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 3 ways as a sum of consecutive naturals, for example, 656786 + ... + 688367.

It is an arithmetic number, because the mean of its divisors is an integer number (5310667992).

Almost surely, 2^21241311023 is an apocalyptic number.

21241311023 is a deficient number, since it is larger than the sum of its proper divisors (1360945).

21241311023 is a wasteful number, since it uses less digits than its factorization.

21241311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360944.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21241311023 its reverse (32011314212), we get a palindrome (53252625235).

The spelling of 21241311023 in words is "twenty-one billion, two hundred forty-one million, three hundred eleven thousand, twenty-three".