1212122101 has 4 divisors (see below), whose sum is σ = 1212204204. Its totient is φ = 1212040000.

The previous prime is 1212122071. The next prime is 1212122113. The reversal of 1212122101 is 1012212121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 345997201 + 866124900 = 18601^2 + 29430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212122101 - 2⁵ = 1212122069 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 (1212122161) 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, 12100 + ... + 50701.

It is an arithmetic number, because the mean of its divisors is an integer number (303051051).

Almost surely, 2^1212122101 is an apocalyptic number.

It is an amenable number.

1212122101 is a deficient number, since it is larger than the sum of its proper divisors (82103).

1212122101 is an equidigital number, since it uses as much as digits as its factorization.

1212122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82102.

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

The square root of 1212122101 is about 34815.5439566869. The cubic root of 1212122101 is about 1066.2248248911.

Adding to 1212122101 its reverse (1012212121), we get a palindrome (2224334222).

The spelling of 1212122101 in words is "one billion, two hundred twelve million, one hundred twenty-two thousand, one hundred one".