1021055121 has 12 divisors (see below), whose sum is σ = 1499855760. Its totient is φ = 669165720.

The previous prime is 1021055039. The next prime is 1021055159. The reversal of 1021055121 is 1215501201.

1021055121 is a `hidden beast` number, since 102 + 10 + 551 + 2 + 1 = 666.

It is not a de Polignac number, because 1021055121 - 2¹⁴ = 1021038737 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021055094 and 1021055103.

It is not an unprimeable number, because it can be changed into a prime (1021055521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 960915 + ... + 961976.

It is an arithmetic number, because the mean of its divisors is an integer number (124987980).

Almost surely, 2^1021055121 is an apocalyptic number.

It is an amenable number.

1021055121 is a deficient number, since it is larger than the sum of its proper divisors (478800639).

1021055121 is a wasteful number, since it uses less digits than its factorization.

1021055121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922956 (or 1922953 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1021055121 is about 31953.9531357233. The cubic root of 1021055121 is about 1006.9696843130.

Adding to 1021055121 its reverse (1215501201), we get a palindrome (2236556322).

The spelling of 1021055121 in words is "one billion, twenty-one million, fifty-five thousand, one hundred twenty-one".