1212020101 has 4 divisors (see below), whose sum is σ = 1212096172. Its totient is φ = 1211944032.

The previous prime is 1212020093. The next prime is 1212020123. The reversal of 1212020101 is 1010202121.

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 783944001 + 428076100 = 27999^2 + 20690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212020101 - 2³ = 1212020093 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 (1212020191) 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, 3960 + ... + 49393.

It is an arithmetic number, because the mean of its divisors is an integer number (303024043).

Almost surely, 2^1212020101 is an apocalyptic number.

It is an amenable number.

1212020101 is a deficient number, since it is larger than the sum of its proper divisors (76071).

1212020101 is an equidigital number, since it uses as much as digits as its factorization.

1212020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76070.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1212020101 is about 34814.0790629308. The cubic root of 1212020101 is about 1066.1949164677.

Adding to 1212020101 its reverse (1010202121), we get a palindrome (2222222222).

It can be divided in two parts, 1212020 and 101, that added together give a palindrome (1212121).

The spelling of 1212020101 in words is "one billion, two hundred twelve million, twenty thousand, one hundred one".