21340022043 has 4 divisors (see below), whose sum is σ = 28453362728. Its totient is φ = 14226681360.

The previous prime is 21340022027. The next prime is 21340022087. The reversal of 21340022043 is 34022004312.

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

It is not a de Polignac number, because 21340022043 - 2⁴ = 21340022027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340022023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3556670338 + ... + 3556670343.

It is an arithmetic number, because the mean of its divisors is an integer number (7113340682).

Almost surely, 2^21340022043 is an apocalyptic number.

21340022043 is a deficient number, since it is larger than the sum of its proper divisors (7113340685).

21340022043 is an equidigital number, since it uses as much as digits as its factorization.

21340022043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7113340684.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21340022043 its reverse (34022004312), we get a palindrome (55362026355).

The spelling of 21340022043 in words is "twenty-one billion, three hundred forty million, twenty-two thousand, forty-three".