1012121101 has 4 divisors (see below), whose sum is σ = 1022142204. Its totient is φ = 1002100000.

The previous prime is 1012121081. The next prime is 1012121113. The reversal of 1012121101 is 1011212101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1011212101 = 101 ⋅10012001.

It can be written as a sum of positive squares in 2 ways, for example, as 855621001 + 156500100 = 29251^2 + 12510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012121101 - 2⁵ = 1012121069 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 (1012121191) 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, 5010400 + ... + 5010601.

It is an arithmetic number, because the mean of its divisors is an integer number (255535551).

Almost surely, 2^1012121101 is an apocalyptic number.

It is an amenable number.

1012121101 is a deficient number, since it is larger than the sum of its proper divisors (10021103).

1012121101 is a wasteful number, since it uses less digits than its factorization.

1012121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021102.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1012121101 is about 31813.8507728945. The cubic root of 1012121101 is about 1004.0241514827.

Adding to 1012121101 its reverse (1011212101), we get a palindrome (2023333202).

The spelling of 1012121101 in words is "one billion, twelve million, one hundred twenty-one thousand, one hundred one".