1011212121 has 8 divisors (see below), whose sum is σ = 1348444864. Its totient is φ = 674060400.

The previous prime is 1011212117. The next prime is 1011212143. The reversal of 1011212121 is 1212121101.

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

It is not a de Polignac number, because 1011212121 - 2² = 1011212117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011212097 and 1011212106.

It is not an unprimeable number, because it can be changed into a prime (1011212171) 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, 20700 + ... + 49506.

It is an arithmetic number, because the mean of its divisors is an integer number (168555608).

Almost surely, 2^1011212121 is an apocalyptic number.

It is an amenable number.

1011212121 is a deficient number, since it is larger than the sum of its proper divisors (337232743).

1011212121 is a wasteful number, since it uses less digits than its factorization.

1011212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40511.

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

The square root of 1011212121 is about 31799.5616479221. The cubic root of 1011212121 is about 1003.7234920655.

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

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

The spelling of 1011212121 in words is "one billion, eleven million, two hundred twelve thousand, one hundred twenty-one".