21222231305 has 16 divisors (see below), whose sum is σ = 27795913344. Its totient is φ = 15426526080.

The previous prime is 21222231301. The next prime is 21222231319. The reversal of 21222231305 is 50313222212.

It is not a de Polignac number, because 21222231305 - 2² = 21222231301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222231301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12812 + ... + 206418.

It is an arithmetic number, because the mean of its divisors is an integer number (1737244584).

Almost surely, 2^21222231305 is an apocalyptic number.

It is an amenable number.

21222231305 is a deficient number, since it is larger than the sum of its proper divisors (6573682039).

21222231305 is a wasteful number, since it uses less digits than its factorization.

21222231305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195616.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21222231305 its reverse (50313222212), we get a palindrome (71535453517).

The spelling of 21222231305 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred five".