1212041101 has 4 divisors (see below), whose sum is σ = 1216547100. Its totient is φ = 1207535104.

The previous prime is 1212041063. The next prime is 1212041111. The reversal of 1212041101 is 1011402121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1011402121 = 1553 ⋅651257.

It can be written as a sum of positive squares in 2 ways, for example, as 334341225 + 877699876 = 18285^2 + 29626^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212041101 - 2²¹ = 1209943949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212041111) 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, 2252596 + ... + 2253133.

It is an arithmetic number, because the mean of its divisors is an integer number (304136775).

Almost surely, 2^1212041101 is an apocalyptic number.

It is an amenable number.

1212041101 is a deficient number, since it is larger than the sum of its proper divisors (4505999).

1212041101 is an equidigital number, since it uses as much as digits as its factorization.

1212041101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505998.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212041101 is about 34814.3806637430. The cubic root of 1212041101 is about 1066.2010742215.

Adding to 1212041101 its reverse (1011402121), we get a palindrome (2223443222).

The spelling of 1212041101 in words is "one billion, two hundred twelve million, forty-one thousand, one hundred one".