1212121101 has 8 divisors (see below), whose sum is σ = 1616322400. Its totient is φ = 808000272.

The previous prime is 1212121069. The next prime is 1212121121. The reversal of 1212121101 is 1011212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212121101 - 2⁵ = 1212121069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47550 + ... + 68448.

It is an arithmetic number, because the mean of its divisors is an integer number (202040300).

Almost surely, 2^1212121101 is an apocalyptic number.

It is an amenable number.

1212121101 is a deficient number, since it is larger than the sum of its proper divisors (404201299).

1212121101 is a wasteful number, since it uses less digits than its factorization.

1212121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40235.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1212121101 is about 34815.5295952826. The cubic root of 1212121101 is about 1066.2245316794.

Adding to 1212121101 its reverse (1011212121), we get a palindrome (2223333222).

It can be divided in two parts, 1212121 and 101, that multiplied together give a palindrome (122424221).

The spelling of 1212121101 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred one".