1213121234 has 16 divisors (see below), whose sum is σ = 2062798080. Its totient is φ = 530433360.

The previous prime is 1213121209. The next prime is 1213121251. The reversal of 1213121234 is 4321213121.

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 in 7 ways as a sum of consecutive naturals, for example, 1227362 + ... + 1228349.

It is an arithmetic number, because the mean of its divisors is an integer number (128924880).

Almost surely, 2^1213121234 is an apocalyptic number.

1213121234 is a deficient number, since it is larger than the sum of its proper divisors (849676846).

1213121234 is a wasteful number, since it uses less digits than its factorization.

1213121234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455745.

The product of its digits is 288, while the sum is 20.

The square root of 1213121234 is about 34829.8899510176. The cubic root of 1213121234 is about 1066.5177018319.

Adding to 1213121234 its reverse (4321213121), we get a palindrome (5534334355).

The spelling of 1213121234 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred thirty-four".