21224016366 has 64 divisors (see below), whose sum is σ = 49245926400. Its totient is φ = 5972795136.

The previous prime is 21224016313. The next prime is 21224016371. The reversal of 21224016366 is 66361042212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 972300 + ... + 993888.

It is an arithmetic number, because the mean of its divisors is an integer number (769467600).

Almost surely, 2^21224016366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224016366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24622963200).

21224016366 is an abundant number, since it is smaller than the sum of its proper divisors (28021910034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224016366 is a wasteful number, since it uses less digits than its factorization.

21224016366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21953.

The product of its (nonzero) digits is 20736, while the sum is 33.

Adding to 21224016366 its reverse (66361042212), we get a palindrome (87585058578).

The spelling of 21224016366 in words is "twenty-one billion, two hundred twenty-four million, sixteen thousand, three hundred sixty-six".