22212549521 has 4 divisors (see below), whose sum is σ = 22220632500. Its totient is φ = 22204466544.

The previous prime is 22212549479. The next prime is 22212549553. The reversal of 22212549521 is 12594521222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7950218896 + 14262330625 = 89164^2 + 119425^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212549521 - 2²⁶ = 22145440657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22212549721) 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, 4037366 + ... + 4042863.

It is an arithmetic number, because the mean of its divisors is an integer number (5555158125).

Almost surely, 2^22212549521 is an apocalyptic number.

It is an amenable number.

22212549521 is a deficient number, since it is larger than the sum of its proper divisors (8082979).

22212549521 is an equidigital number, since it uses as much as digits as its factorization.

22212549521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8082978.

The product of its digits is 28800, while the sum is 35.

The spelling of 22212549521 in words is "twenty-two billion, two hundred twelve million, five hundred forty-nine thousand, five hundred twenty-one".