221222903778 has 54 divisors (see below), whose sum is σ = 487837617579. Its totient is φ = 72452541384.

The previous prime is 221222903773. The next prime is 221222903831. The reversal of 221222903778 is 877309222122.

It can be written as a sum of positive squares in only one way, i.e., 110611451889 + 110611451889 = 332583^2 + 332583^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332583.

It is not an unprimeable number, because it can be changed into a prime (221222903773) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 117733443 + ... + 117735321.

Almost surely, 2^221222903778 is an apocalyptic number.

221222903778 is an abundant number, since it is smaller than the sum of its proper divisors (266614713801).

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

221222903778 is an frugal number, since it uses more digits than its factorization.

221222903778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3884 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 221222903778 in words is "two hundred twenty-one billion, two hundred twenty-two million, nine hundred three thousand, seven hundred seventy-eight".