21224221465 has 8 divisors (see below), whose sum is σ = 25546013568. Its totient is φ = 16928078640.

The previous prime is 21224221457. The next prime is 21224221481. The reversal of 21224221465 is 56412242212.

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

It is not a de Polignac number, because 21224221465 - 2³ = 21224221457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6410497 + ... + 6413806.

It is an arithmetic number, because the mean of its divisors is an integer number (3193251696).

Almost surely, 2^21224221465 is an apocalyptic number.

It is an amenable number.

21224221465 is a deficient number, since it is larger than the sum of its proper divisors (4321792103).

21224221465 is a wasteful number, since it uses less digits than its factorization.

21224221465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12824639.

The product of its digits is 15360, while the sum is 31.

Adding to 21224221465 its reverse (56412242212), we get a palindrome (77636463677).

The spelling of 21224221465 in words is "twenty-one billion, two hundred twenty-four million, two hundred twenty-one thousand, four hundred sixty-five".