21450411309 has 8 divisors (see below), whose sum is σ = 28606202080. Its totient is φ = 14297447376.

The previous prime is 21450411293. The next prime is 21450411319. The reversal of 21450411309 is 90311405412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21450411309 - 2⁴ = 21450411293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450411319) 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, 688939 + ... + 719400.

It is an arithmetic number, because the mean of its divisors is an integer number (3575775260).

Almost surely, 2^21450411309 is an apocalyptic number.

It is an amenable number.

21450411309 is a deficient number, since it is larger than the sum of its proper divisors (7155790771).

21450411309 is a wasteful number, since it uses less digits than its factorization.

21450411309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413419.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21450411309 in words is "twenty-one billion, four hundred fifty million, four hundred eleven thousand, three hundred nine".