221129790338 has 6 divisors (see below), whose sum is σ = 331695683049. Its totient is φ = 110564562656.

The previous prime is 221129790313. The next prime is 221129790341. The reversal of 221129790338 is 833097921122.

It can be written as a sum of positive squares in 2 ways, for example, as 164322404689 + 56807385649 = 405367^2 + 238343^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332513.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221129790292 and 221129790301.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 498770 + ... + 831282.

Almost surely, 2^221129790338 is an apocalyptic number.

221129790338 is a deficient number, since it is larger than the sum of its proper divisors (110565892711).

221129790338 is an frugal number, since it uses more digits than its factorization.

221129790338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665028 (or 332515 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 221129790338 in words is "two hundred twenty-one billion, one hundred twenty-nine million, seven hundred ninety thousand, three hundred thirty-eight".