21030343443 has 8 divisors (see below), whose sum is σ = 31156064400. Its totient is φ = 14020228944.

The previous prime is 21030343427. The next prime is 21030343447. The reversal of 21030343443 is 34434303012.

21030343443 is a `hidden beast` number, since 2 + 10 + 303 + 4 + 344 + 3 = 666.

It is not a de Polignac number, because 21030343443 - 2⁴ = 21030343427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 778901609 = 21030343443 / (2 + 1 + 0 + 3 + 0 + 3 + 4 + 3 + 4 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (21030343447) 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, 389450778 + ... + 389450831.

It is an arithmetic number, because the mean of its divisors is an integer number (3894508050).

Almost surely, 2^21030343443 is an apocalyptic number.

21030343443 is a deficient number, since it is larger than the sum of its proper divisors (10125720957).

21030343443 is an equidigital number, since it uses as much as digits as its factorization.

21030343443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778901618 (or 778901612 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21030343443 its reverse (34434303012), we get a palindrome (55464646455).

The spelling of 21030343443 in words is "twenty-one billion, thirty million, three hundred forty-three thousand, four hundred forty-three".