21423343043 has 8 divisors (see below), whose sum is σ = 22214984400. Its totient is φ = 20635228768.

The previous prime is 21423342989. The next prime is 21423343093. The reversal of 21423343043 is 34034332412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21423343043 - 2²⁴ = 21406565827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423342997 and 21423343015.

It is not an unprimeable number, because it can be changed into a prime (21423343093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869396 + ... + 893697.

It is an arithmetic number, because the mean of its divisors is an integer number (2776873050).

Almost surely, 2^21423343043 is an apocalyptic number.

21423343043 is a deficient number, since it is larger than the sum of its proper divisors (791641357).

21423343043 is a wasteful number, since it uses less digits than its factorization.

21423343043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763541.

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 21423343043 its reverse (34034332412), we get a palindrome (55457675455).

The spelling of 21423343043 in words is "twenty-one billion, four hundred twenty-three million, three hundred forty-three thousand, forty-three".