1522255221 has 32 divisors (see below), whose sum is σ = 2320371200. Its totient is φ = 985608000.

The previous prime is 1522255219. The next prime is 1522255237. The reversal of 1522255221 is 1225522251.

It is a happy number.

It is not a de Polignac number, because 1522255221 - 2¹ = 1522255219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522255261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 749235 + ... + 751263.

It is an arithmetic number, because the mean of its divisors is an integer number (72511600).

Almost surely, 2^1522255221 is an apocalyptic number.

It is an amenable number.

1522255221 is a deficient number, since it is larger than the sum of its proper divisors (798115979).

1522255221 is a wasteful number, since it uses less digits than its factorization.

1522255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826 (or 2820 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 1522255221 is about 39016.0892581509. The cubic root of 1522255221 is about 1150.3477766063.

Adding to 1522255221 its reverse (1225522251), we get a palindrome (2747777472).

The spelling of 1522255221 in words is "one billion, five hundred twenty-two million, two hundred fifty-five thousand, two hundred twenty-one".