21605050443 has 8 divisors (see below), whose sum is σ = 28807789968. Its totient is φ = 14402838944.

The previous prime is 21605050427. The next prime is 21605050459. The reversal of 21605050443 is 34405050612.

It is an interprime number because it is at equal distance from previous prime (21605050427) and next prime (21605050459).

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 21605050443 - 2⁴ = 21605050427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21605050443.

It is not an unprimeable number, because it can be changed into a prime (21605055443) 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, 23880 + ... + 209237.

It is an arithmetic number, because the mean of its divisors is an integer number (3600973746).

Almost surely, 2^21605050443 is an apocalyptic number.

21605050443 is a deficient number, since it is larger than the sum of its proper divisors (7202739525).

21605050443 is a wasteful number, since it uses less digits than its factorization.

21605050443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264013.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21605050443 in words is "twenty-one billion, six hundred five million, fifty thousand, four hundred forty-three".