1020012121 has 4 divisors (see below), whose sum is σ = 1080012852. Its totient is φ = 960011392.

The previous prime is 1020012113. The next prime is 1020012139. The reversal of 1020012121 is 1212100201.

1020012121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 821624896 + 198387225 = 28664^2 + 14085^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020012121 - 2³ = 1020012113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020012098 and 1020012107.

It is not an unprimeable number, because it can be changed into a prime (1020012151) 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, 30000340 + ... + 30000373.

It is an arithmetic number, because the mean of its divisors is an integer number (270003213).

Almost surely, 2^1020012121 is an apocalyptic number.

It is an amenable number.

1020012121 is a deficient number, since it is larger than the sum of its proper divisors (60000731).

1020012121 is an equidigital number, since it uses as much as digits as its factorization.

1020012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60000730.

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

The square root of 1020012121 is about 31937.6286063947. The cubic root of 1020012121 is about 1006.6266968887.

Adding to 1020012121 its reverse (1212100201), we get a palindrome (2232112322).

The spelling of 1020012121 in words is "one billion, twenty million, twelve thousand, one hundred twenty-one".