1221055303225 has 6 divisors (see below), whose sum is σ = 1514108576030. Its totient is φ = 976844242560.

The previous prime is 1221055303217. The next prime is 1221055303309. The reversal of 1221055303225 is 5223035501221.

It can be written as a sum of positive squares in 3 ways, for example, as 231404944 + 1220823898281 = 15212^2 + 1104909^2 .

It is not a de Polignac number, because 1221055303225 - 2³ = 1221055303217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24421106040 + ... + 24421106089.

Almost surely, 2^{1221055303225} is an apocalyptic number.

It is an amenable number.

1221055303225 is a deficient number, since it is larger than the sum of its proper divisors (293053272805).

1221055303225 is an equidigital number, since it uses as much as digits as its factorization.

1221055303225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48842212139 (or 48842212134 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 1221055303225 in words is "one trillion, two hundred twenty-one billion, fifty-five million, three hundred three thousand, two hundred twenty-five".