1011212121201 has 16 divisors (see below), whose sum is σ = 1428056858304. Its totient is φ = 634280136704.

The previous prime is 1011212121163. The next prime is 1011212121221. The reversal of 1011212121201 is 1021212121101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1011212121201 - 2⁶ = 1011212121137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011212121221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3058416 + ... + 3372881.

It is an arithmetic number, because the mean of its divisors is an integer number (89253553644).

Almost surely, 2^{1011212121201} is an apocalyptic number.

It is an amenable number.

1011212121201 is a deficient number, since it is larger than the sum of its proper divisors (416844737103).

1011212121201 is a wasteful number, since it uses less digits than its factorization.

1011212121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434400.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1011212121201 its reverse (1021212121101), we get a palindrome (2032424242302).

It can be divided in two parts, 10 and 11212121201, that added together give a palindrome (11212121211).

The spelling of 1011212121201 in words is "one trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred one".