1212100313 has 4 divisors (see below), whose sum is σ = 1212676608. Its totient is φ = 1211524020.

The previous prime is 1212100303. The next prime is 1212100333. The reversal of 1212100313 is 3130012121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3130012121 = 40289 ⋅77689.

It is a cyclic number.

It is not a de Polignac number, because 1212100313 - 2¹⁰ = 1212099289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212100303) 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 3 ways as a sum of consecutive naturals, for example, 284981 + ... + 289202.

It is an arithmetic number, because the mean of its divisors is an integer number (303169152).

Almost surely, 2^1212100313 is an apocalyptic number.

It is an amenable number.

1212100313 is a deficient number, since it is larger than the sum of its proper divisors (576295).

1212100313 is an equidigital number, since it uses as much as digits as its factorization.

1212100313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576294.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1212100313 is about 34815.2310490682. The cubic root of 1212100313 is about 1066.2184363582.

Adding to 1212100313 its reverse (3130012121), we get a palindrome (4342112434).

The spelling of 1212100313 in words is "one billion, two hundred twelve million, one hundred thousand, three hundred thirteen".