21030343043 has 16 divisors (see below), whose sum is σ = 22449599040. Its totient is φ = 19658225664.

The previous prime is 21030343007. The next prime is 21030343049. The reversal of 21030343043 is 34034303012.

It is a cyclic number.

It is not a de Polignac number, because 21030343043 - 2⁶ = 21030342979 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030343049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125555 + ... + 240467.

It is an arithmetic number, because the mean of its divisors is an integer number (1403099940).

Almost surely, 2^21030343043 is an apocalyptic number.

21030343043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21030343043 is a deficient number, since it is larger than the sum of its proper divisors (1419255997).

21030343043 is a wasteful number, since it uses less digits than its factorization.

21030343043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115118.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21030343043 its reverse (34034303012), we get a palindrome (55064646055).

The spelling of 21030343043 in words is "twenty-one billion, thirty million, three hundred forty-three thousand, forty-three".