1243121102 has 4 divisors (see below), whose sum is σ = 1864681656. Its totient is φ = 621560550.

The previous prime is 1243121071. The next prime is 1243121119. The reversal of 1243121102 is 2011213421.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310780274 + ... + 310780277.

It is an arithmetic number, because the mean of its divisors is an integer number (466170414).

Almost surely, 2^1243121102 is an apocalyptic number.

1243121102 is a deficient number, since it is larger than the sum of its proper divisors (621560554).

1243121102 is an equidigital number, since it uses as much as digits as its factorization.

1243121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621560553.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1243121102 is about 35257.9225423166. The cubic root of 1243121102 is about 1075.2376909418.

Adding to 1243121102 its reverse (2011213421), we get a palindrome (3254334523).

It can be divided in two parts, 12431 and 21102, that added together give a palindrome (33533).

The spelling of 1243121102 in words is "one billion, two hundred forty-three million, one hundred twenty-one thousand, one hundred two".