1212104129 has 4 divisors (see below), whose sum is σ = 1221648384. Its totient is φ = 1202559876.

The previous prime is 1212104057. The next prime is 1212104141. The reversal of 1212104129 is 9214012121.

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: 9214012121 = 17 ⋅542000713.

It is a cyclic number.

It is not a de Polignac number, because 1212104129 - 2¹² = 1212100033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212100129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771937 + ... + 4772190.

It is an arithmetic number, because the mean of its divisors is an integer number (305412096).

Almost surely, 2^1212104129 is an apocalyptic number.

It is an amenable number.

1212104129 is a deficient number, since it is larger than the sum of its proper divisors (9544255).

1212104129 is an equidigital number, since it uses as much as digits as its factorization.

1212104129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9544254.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1212104129 is about 34815.2858526251. The cubic root of 1212104129 is about 1066.2195552659.

The spelling of 1212104129 in words is "one billion, two hundred twelve million, one hundred four thousand, one hundred twenty-nine".