21210346043 has 4 divisors (see below), whose sum is σ = 21526918440. Its totient is φ = 20893773648.

The previous prime is 21210346013. The next prime is 21210346063. The reversal of 21210346043 is 34064301212.

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 21210346043 - 2¹² = 21210341947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210346013) 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 3 ways as a sum of consecutive naturals, for example, 158286098 + ... + 158286231.

It is an arithmetic number, because the mean of its divisors is an integer number (5381729610).

Almost surely, 2^21210346043 is an apocalyptic number.

21210346043 is a deficient number, since it is larger than the sum of its proper divisors (316572397).

21210346043 is an equidigital number, since it uses as much as digits as its factorization.

21210346043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316572396.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21210346043 its reverse (34064301212), we get a palindrome (55274647255).

The spelling of 21210346043 in words is "twenty-one billion, two hundred ten million, three hundred forty-six thousand, forty-three".