1222125520 has 80 divisors (see below), whose sum is σ = 3542594688. Its totient is φ = 380920320.

The previous prime is 1222125491. The next prime is 1222125521. The reversal of 1222125520 is 255212221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1222125491 and 1222125500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222125521) 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 in 15 ways as a sum of consecutive naturals, for example, 93039 + ... + 105358.

Almost surely, 2^1222125520 is an apocalyptic number.

1222125520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222125520 is an abundant number, since it is smaller than the sum of its proper divisors (2320469168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222125520 is a wasteful number, since it uses less digits than its factorization.

1222125520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198428 (or 198422 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1222125520 is about 34958.9118823799. The cubic root of 1222125520 is about 1069.1499114642.

Adding to 1222125520 its reverse (255212221), we get a palindrome (1477337741).

The spelling of 1222125520 in words is "one billion, two hundred twenty-two million, one hundred twenty-five thousand, five hundred twenty".