21343421021023 has 4 divisors (see below), whose sum is σ = 22271395848048. Its totient is φ = 20415446194000.

The previous prime is 21343421021011. The next prime is 21343421021029. The reversal of 21343421021023 is 32012012434312.

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 21343421021023 - 2⁵ = 21343421020991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21343421020982 and 21343421021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343421021029) 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, 463987413478 + ... + 463987413523.

It is an arithmetic number, because the mean of its divisors is an integer number (5567848962012).

Almost surely, 2^{21343421021023} is an apocalyptic number.

21343421021023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21343421021023 is a deficient number, since it is larger than the sum of its proper divisors (927974827025).

21343421021023 is an equidigital number, since it uses as much as digits as its factorization.

21343421021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927974827024.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21343421021023 its reverse (32012012434312), we get a palindrome (53355433455335).

The spelling of 21343421021023 in words is "twenty-one trillion, three hundred forty-three billion, four hundred twenty-one million, twenty-one thousand, twenty-three".