1222355500 has 48 divisors (see below), whose sum is σ = 2810152800. Its totient is φ = 463204800.

The previous prime is 1222355473. The next prime is 1222355501. The reversal of 1222355500 is 55532221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1222355501) 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, 54835 + ... + 73834.

It is an arithmetic number, because the mean of its divisors is an integer number (58544850).

Almost surely, 2^1222355500 is an apocalyptic number.

1222355500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222355500 is an abundant number, since it is smaller than the sum of its proper divisors (1587797300).

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

1222355500 is a wasteful number, since it uses less digits than its factorization.

1222355500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128707 (or 128695 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1222355500 is about 34962.2010176705. The cubic root of 1222355500 is about 1069.2169715904.

Adding to 1222355500 its reverse (55532221), we get a palindrome (1277887721).

The spelling of 1222355500 in words is "one billion, two hundred twenty-two million, three hundred fifty-five thousand, five hundred".