1225035221 has 2 divisors, whose sum is σ = 1225035222. Its totient is φ = 1225035220.

The previous prime is 1225035199. The next prime is 1225035233. The reversal of 1225035221 is 1225305221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 762312100 + 462723121 = 27610^2 + 21511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225035221 - 2¹⁰ = 1225034197 is a prime.

It is a super-2 number, since 2×1225035221² = 3001422585381037682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225035421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612517610 + 612517611.

It is an arithmetic number, because the mean of its divisors is an integer number (612517611).

Almost surely, 2^1225035221 is an apocalyptic number.

It is an amenable number.

1225035221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225035221 is an equidigital number, since it uses as much as digits as its factorization.

1225035221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1225035221 is about 35000.5031535262. The cubic root of 1225035221 is about 1069.9977351686.

The spelling of 1225035221 in words is "one billion, two hundred twenty-five million, thirty-five thousand, two hundred twenty-one".