22206122555521 has 4 divisors (see below), whose sum is σ = 22206160138500. Its totient is φ = 22206084972544.

The previous prime is 22206122555509. The next prime is 22206122555557. The reversal of 22206122555521 is 12555522160222.

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 20155610250000 + 2050512305521 = 4489500^2 + 1431961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22206122555521 is a prime.

It is a super-2 number, since 2×22206122555521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22206122555021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17890816 + ... + 19091713.

It is an arithmetic number, because the mean of its divisors is an integer number (5551540034625).

Almost surely, 2^{22206122555521} is an apocalyptic number.

It is an amenable number.

22206122555521 is a deficient number, since it is larger than the sum of its proper divisors (37582979).

22206122555521 is an equidigital number, since it uses as much as digits as its factorization.

22206122555521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37582978.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 22206122555521 in words is "twenty-two trillion, two hundred six billion, one hundred twenty-two million, five hundred fifty-five thousand, five hundred twenty-one".