22004121520 has 20 divisors (see below), whose sum is σ = 51159582720. Its totient is φ = 8801648576.

The previous prime is 22004121511. The next prime is 22004121523. The reversal of 22004121520 is 2512140022.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×22004121520² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22004121523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137525680 + ... + 137525839.

It is an arithmetic number, because the mean of its divisors is an integer number (2557979136).

Almost surely, 2^22004121520 is an apocalyptic number.

22004121520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22004121520 is an abundant number, since it is smaller than the sum of its proper divisors (29155461200).

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

22004121520 is a wasteful number, since it uses less digits than its factorization.

22004121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275051532 (or 275051526 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 22004121520 its reverse (2512140022), we get a palindrome (24516261542).

The spelling of 22004121520 in words is "twenty-two billion, four million, one hundred twenty-one thousand, five hundred twenty".