1223220100 has 18 divisors (see below), whose sum is σ = 2654387834. Its totient is φ = 489288000.

The previous prime is 1223220067. The next prime is 1223220107. The reversal of 1223220100 is 10223221.

It can be written as a sum of positive squares in 3 ways, for example, as 327175744 + 896044356 = 18088^2 + 29934^2 .

It is not an unprimeable number, because it can be changed into a prime (1223220107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6116001 + ... + 6116200.

Almost surely, 2^1223220100 is an apocalyptic number.

1223220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223220100 is an abundant number, since it is smaller than the sum of its proper divisors (1431167734).

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

1223220100 is a wasteful number, since it uses less digits than its factorization.

1223220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12232215 (or 12232208 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1223220100 is about 34974.5636141468. The cubic root of 1223220100 is about 1069.4690060487.

Adding to 1223220100 its reverse (10223221), we get a palindrome (1233443321).

The spelling of 1223220100 in words is "one billion, two hundred twenty-three million, two hundred twenty thousand, one hundred".