1225004221 has 16 divisors (see below), whose sum is σ = 1424908800. Its totient is φ = 1031470128.

The previous prime is 1225004213. The next prime is 1225004227. The reversal of 1225004221 is 1224005221.

It is a cyclic number.

It is not a de Polignac number, because 1225004221 - 2³ = 1225004213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225004227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98110 + ... + 109888.

It is an arithmetic number, because the mean of its divisors is an integer number (89056800).

Almost surely, 2^1225004221 is an apocalyptic number.

It is an amenable number.

1225004221 is a deficient number, since it is larger than the sum of its proper divisors (199904579).

1225004221 is a wasteful number, since it uses less digits than its factorization.

1225004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12048.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1225004221 is about 35000.0602999481. The cubic root of 1225004221 is about 1069.9887095207.

Adding to 1225004221 its reverse (1224005221), we get a palindrome (2449009442).

The spelling of 1225004221 in words is "one billion, two hundred twenty-five million, four thousand, two hundred twenty-one".