1221055122225 has 48 divisors (see below), whose sum is σ = 2022437412864. Its totient is φ = 650060616000.

The previous prime is 1221055122173. The next prime is 1221055122229. The reversal of 1221055122225 is 5222215501221.

It is not a de Polignac number, because 1221055122225 - 2³⁴ = 1203875253041 is a prime.

It is a super-2 number, since 2×1221055122225² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221055122192 and 1221055122201.

It is not an unprimeable number, because it can be changed into a prime (1221055122229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130296790 + ... + 130306160.

It is an arithmetic number, because the mean of its divisors is an integer number (42134112768).

Almost surely, 2^{1221055122225} is an apocalyptic number.

1221055122225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221055122225 is a deficient number, since it is larger than the sum of its proper divisors (801382290639).

1221055122225 is a wasteful number, since it uses less digits than its factorization.

1221055122225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12318 (or 12313 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The spelling of 1221055122225 in words is "one trillion, two hundred twenty-one billion, fifty-five million, one hundred twenty-two thousand, two hundred twenty-five".