21403212443 has 8 divisors (see below), whose sum is σ = 21821832768. Its totient is φ = 20987982144.

The previous prime is 21403212409. The next prime is 21403212463. The reversal of 21403212443 is 34421230412.

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 21403212443 - 2¹⁶ = 21403146907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403212463) 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, 834755 + ... + 860012.

It is an arithmetic number, because the mean of its divisors is an integer number (2727729096).

Almost surely, 2^21403212443 is an apocalyptic number.

21403212443 is a deficient number, since it is larger than the sum of its proper divisors (418620325).

21403212443 is a wasteful number, since it uses less digits than its factorization.

21403212443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695013.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21403212443 its reverse (34421230412), we get a palindrome (55824442855).

The spelling of 21403212443 in words is "twenty-one billion, four hundred three million, two hundred twelve thousand, four hundred forty-three".