1242100223 has 16 divisors (see below), whose sum is σ = 1618666560. Its totient is φ = 924950016.

The previous prime is 1242100213. The next prime is 1242100253. The reversal of 1242100223 is 3220012421.

It is a cyclic number.

It is not a de Polignac number, because 1242100223 - 2⁶ = 1242100159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242100213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399908 + ... + 403001.

It is an arithmetic number, because the mean of its divisors is an integer number (101166660).

Almost surely, 2^1242100223 is an apocalyptic number.

1242100223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1242100223 is a deficient number, since it is larger than the sum of its proper divisors (376566337).

1242100223 is a wasteful number, since it uses less digits than its factorization.

1242100223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802946.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1242100223 is about 35243.4422694492. The cubic root of 1242100223 is about 1074.9432738771.

Adding to 1242100223 its reverse (3220012421), we get a palindrome (4462112644).

The spelling of 1242100223 in words is "one billion, two hundred forty-two million, one hundred thousand, two hundred twenty-three".