22001021320 has 16 divisors (see below), whose sum is σ = 49502298060. Its totient is φ = 8800408512.

The previous prime is 22001021309. The next prime is 22001021321. The reversal of 22001021320 is 2312010022.

It can be written as a sum of positive squares in 2 ways, for example, as 20913208996 + 1087812324 = 144614^2 + 32982^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22001021320.

It is not an unprimeable number, because it can be changed into a prime (22001021321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275012727 + ... + 275012806.

Almost surely, 2^22001021320 is an apocalyptic number.

22001021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001021320 is an abundant number, since it is smaller than the sum of its proper divisors (27501276740).

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

22001021320 is a wasteful number, since it uses less digits than its factorization.

22001021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550025544 (or 550025540 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 22001021320 its reverse (2312010022), we get a palindrome (24313031342).

The spelling of 22001021320 in words is "twenty-two billion, one million, twenty-one thousand, three hundred twenty".