21343120043 has 16 divisors (see below), whose sum is σ = 25466628096. Its totient is φ = 17489107680.

The previous prime is 21343120037. The next prime is 21343120061. The reversal of 21343120043 is 34002134312.

It is a cyclic number.

It is not a de Polignac number, because 21343120043 - 2⁶ = 21343119979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21343120063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265805 + ... + 336657.

It is an arithmetic number, because the mean of its divisors is an integer number (1591664256).

Almost surely, 2^21343120043 is an apocalyptic number.

21343120043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21343120043 is a deficient number, since it is larger than the sum of its proper divisors (4123508053).

21343120043 is a wasteful number, since it uses less digits than its factorization.

21343120043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72754.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21343120043 its reverse (34002134312), we get a palindrome (55345254355).

The spelling of 21343120043 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty thousand, forty-three".