1212312123 has 32 divisors (see below), whose sum is σ = 1963872000. Its totient is φ = 733017600.

The previous prime is 1212312113. The next prime is 1212312139. The reversal of 1212312123 is 3212132121.

It is not a de Polignac number, because 1212312123 - 2²² = 1208117819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212312096 and 1212312105.

It is not an unprimeable number, because it can be changed into a prime (1212312113) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 128808 + ... + 137898.

It is an arithmetic number, because the mean of its divisors is an integer number (61371000).

Almost surely, 2^1212312123 is an apocalyptic number.

1212312123 is a deficient number, since it is larger than the sum of its proper divisors (751559877).

1212312123 is a wasteful number, since it uses less digits than its factorization.

1212312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560 (or 9554 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1212312123 is about 34818.2728319485. The cubic root of 1212312123 is about 1066.2805386367.

Adding to 1212312123 its reverse (3212132121), we get a palindrome (4424444244).

The spelling of 1212312123 in words is "one billion, two hundred twelve million, three hundred twelve thousand, one hundred twenty-three".