21222231330 has 128 divisors (see below), whose sum is σ = 54207014400. Its totient is φ = 5306425344.

The previous prime is 21222231319. The next prime is 21222231391. The reversal of 21222231330 is 3313222212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21222231297 and 21222231306.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7293916 + ... + 7296824.

It is an arithmetic number, because the mean of its divisors is an integer number (423492300).

Almost surely, 2^21222231330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222231330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27103507200).

21222231330 is an abundant number, since it is smaller than the sum of its proper divisors (32984783070).

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

21222231330 is a wasteful number, since it uses less digits than its factorization.

21222231330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21222231330 its reverse (3313222212), we get a palindrome (24535453542).

The spelling of 21222231330 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred thirty".