1244220100 has 18 divisors (see below), whose sum is σ = 2699957834. Its totient is φ = 497688000.

The previous prime is 1244220091. The next prime is 1244220113. The reversal of 1244220100 is 10224421.

It can be written as a sum of positive squares in 3 ways, for example, as 4194304 + 1240025796 = 2048^2 + 35214^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6221001 + ... + 6221200.

Almost surely, 2^1244220100 is an apocalyptic number.

1244220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244220100 is an abundant number, since it is smaller than the sum of its proper divisors (1455737734).

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

1244220100 is a wasteful number, since it uses less digits than its factorization.

1244220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12442215 (or 12442208 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1244220100 is about 35273.5042205903. The cubic root of 1244220100 is about 1075.5544570807.

Adding to 1244220100 its reverse (10224421), we get a palindrome (1254444521).

It can be divided in two parts, 124 and 4220100, that added together give a palindrome (4220224).

The spelling of 1244220100 in words is "one billion, two hundred forty-four million, two hundred twenty thousand, one hundred".