1212323121 has 6 divisors (see below), whose sum is σ = 1751133410. Its totient is φ = 808215408.

The previous prime is 1212323053. The next prime is 1212323129. The reversal of 1212323121 is 1213232121.

1212323121 is a `hidden beast` number, since 121 + 232 + 312 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1120910400 + 91412721 = 33480^2 + 9561^2 .

It is not a de Polignac number, because 1212323121 - 2⁹ = 1212322609 is a prime.

It is a super-2 number, since 2×1212323121² = 2939454699422361282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212323094 and 1212323103.

It is not an unprimeable number, because it can be changed into a prime (1212323129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67351276 + ... + 67351293.

Almost surely, 2^1212323121 is an apocalyptic number.

It is an amenable number.

1212323121 is a deficient number, since it is larger than the sum of its proper divisors (538810289).

1212323121 is a wasteful number, since it uses less digits than its factorization.

1212323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134702575 (or 134702572 counting only the distinct ones).

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

The square root of 1212323121 is about 34818.4307659033. The cubic root of 1212323121 is about 1066.2837630313.

Adding to 1212323121 its reverse (1213232121), we get a palindrome (2425555242).

The spelling of 1212323121 in words is "one billion, two hundred twelve million, three hundred twenty-three thousand, one hundred twenty-one".