1221333225 has 24 divisors (see below), whose sum is σ = 2307739200. Its totient is φ = 558323520.

The previous prime is 1221333221. The next prime is 1221333229. The reversal of 1221333225 is 5223331221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221333221) and next prime (1221333229).

It is not a de Polignac number, because 1221333225 - 2² = 1221333221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221333195 and 1221333204.

It is not an unprimeable number, because it can be changed into a prime (1221333221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1162650 + ... + 1163699.

It is an arithmetic number, because the mean of its divisors is an integer number (96155800).

Almost surely, 2^1221333225 is an apocalyptic number.

1221333225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221333225 is a deficient number, since it is larger than the sum of its proper divisors (1086405975).

1221333225 is a wasteful number, since it uses less digits than its factorization.

1221333225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326369 (or 2326364 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 1221333225 is about 34947.5782422760. The cubic root of 1221333225 is about 1068.9188208401.

Adding to 1221333225 its reverse (5223331221), we get a palindrome (6444664446).

The spelling of 1221333225 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, two hundred twenty-five".