22154220520 has 16 divisors (see below), whose sum is σ = 49846996260. Its totient is φ = 8861688192.

The previous prime is 22154220511. The next prime is 22154220521. The reversal of 22154220520 is 2502245122.

It can be written as a sum of positive squares in 2 ways, for example, as 20114614276 + 2039606244 = 141826^2 + 45162^2 .

It is not an unprimeable number, because it can be changed into a prime (22154220521) 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, 276927717 + ... + 276927796.

Almost surely, 2^22154220520 is an apocalyptic number.

22154220520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22154220520 is an abundant number, since it is smaller than the sum of its proper divisors (27692775740).

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

22154220520 is a wasteful number, since it uses less digits than its factorization.

22154220520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553855524 (or 553855520 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 22154220520 its reverse (2502245122), we get a palindrome (24656465642).

The spelling of 22154220520 in words is "twenty-two billion, one hundred fifty-four million, two hundred twenty thousand, five hundred twenty".