21222231306 has 16 divisors (see below), whose sum is σ = 42487304448. Its totient is φ = 7066936800.

The previous prime is 21222231301. The next prime is 21222231319. The reversal of 21222231306 is 60313222212.

21222231306 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 1778635 + ... + 1790526.

It is an arithmetic number, because the mean of its divisors is an integer number (2655456528).

Almost surely, 2^21222231306 is an apocalyptic number.

21222231306 is an abundant number, since it is smaller than the sum of its proper divisors (21265073142).

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

21222231306 is a wasteful number, since it uses less digits than its factorization.

21222231306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570157.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21222231306 its reverse (60313222212), we get a palindrome (81535453518).

The spelling of 21222231306 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred six".