21401343043 has 4 divisors (see below), whose sum is σ = 21415795128. Its totient is φ = 21386890960.

The previous prime is 21401343017. The next prime is 21401343097. The reversal of 21401343043 is 34034310412.

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 21401343043 - 2⁵ = 21401343011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21401342999 and 21401343017.

It is not an unprimeable number, because it can be changed into a prime (21401343143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7223821 + ... + 7226782.

It is an arithmetic number, because the mean of its divisors is an integer number (5353948782).

Almost surely, 2^21401343043 is an apocalyptic number.

21401343043 is a deficient number, since it is larger than the sum of its proper divisors (14452085).

21401343043 is a wasteful number, since it uses less digits than its factorization.

21401343043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14452084.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21401343043 its reverse (34034310412), we get a palindrome (55435653455).

The spelling of 21401343043 in words is "twenty-one billion, four hundred one million, three hundred forty-three thousand, forty-three".