1020001121 has 4 divisors (see below), whose sum is σ = 1030100244. Its totient is φ = 1009902000.

The previous prime is 1020001063. The next prime is 1020001133. The reversal of 1020001121 is 1211000201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211000201 = 101 ⋅11990101.

It can be written as a sum of positive squares in 2 ways, for example, as 983700496 + 36300625 = 31364^2 + 6025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020001121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020001099 and 1020001108.

It is not an unprimeable number, because it can be changed into a prime (1020001141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5049410 + ... + 5049611.

It is an arithmetic number, because the mean of its divisors is an integer number (257525061).

Almost surely, 2^1020001121 is an apocalyptic number.

It is an amenable number.

1020001121 is a deficient number, since it is larger than the sum of its proper divisors (10099123).

1020001121 is a wasteful number, since it uses less digits than its factorization.

1020001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099122.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1020001121 is about 31937.4563952736. The cubic root of 1020001121 is about 1006.6230783260.

Adding to 1020001121 its reverse (1211000201), we get a palindrome (2231001322).

The spelling of 1020001121 in words is "one billion, twenty million, one thousand, one hundred twenty-one".