1222177220 has 48 divisors (see below), whose sum is σ = 2921643648. Its totient is φ = 425103360.

The previous prime is 1222177213. The next prime is 1222177249. The reversal of 1222177220 is 227712221.

It is a self number, because there is not a number n which added to its sum of digits gives 1222177220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115709 + ... + 125828.

It is an arithmetic number, because the mean of its divisors is an integer number (60867576).

Almost surely, 2^1222177220 is an apocalyptic number.

1222177220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222177220 is an abundant number, since it is smaller than the sum of its proper divisors (1699466428).

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

1222177220 is a wasteful number, since it uses less digits than its factorization.

1222177220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241580 (or 241578 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 1222177220 is about 34959.6513140506. The cubic root of 1222177220 is about 1069.1649874582.

Adding to 1222177220 its reverse (227712221), we get a palindrome (1449889441).

The spelling of 1222177220 in words is "one billion, two hundred twenty-two million, one hundred seventy-seven thousand, two hundred twenty".