221556012122 has 8 divisors (see below), whose sum is σ = 332501954400. Its totient is φ = 110722027324.

The previous prime is 221556012121. The next prime is 221556012133. The reversal of 221556012122 is 221210655122.

It is a happy number.

221556012122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×221556012122³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221556012121) 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, 27984422 + ... + 27992337.

It is an arithmetic number, because the mean of its divisors is an integer number (41562744300).

Almost surely, 2^221556012122 is an apocalyptic number.

221556012122 is a deficient number, since it is larger than the sum of its proper divisors (110945942278).

221556012122 is a wasteful number, since it uses less digits than its factorization.

221556012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55978740.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 221556012122 its reverse (221210655122), we get a palindrome (442766667244).

The spelling of 221556012122 in words is "two hundred twenty-one billion, five hundred fifty-six million, twelve thousand, one hundred twenty-two".