1021020121 has 8 divisors (see below), whose sum is σ = 1129099104. Its totient is φ = 915484320.

The previous prime is 1021020109. The next prime is 1021020149. The reversal of 1021020121 is 1210201201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021020098 and 1021020107.

It is not an unprimeable number, because it can be changed into a prime (1021020181) 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 7 ways as a sum of consecutive naturals, for example, 634951 + ... + 636556.

It is an arithmetic number, because the mean of its divisors is an integer number (141137388).

Almost surely, 2^1021020121 is an apocalyptic number.

1021020121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021020121 is a deficient number, since it is larger than the sum of its proper divisors (108078983).

1021020121 is a wasteful number, since it uses less digits than its factorization.

1021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271591.

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

The square root of 1021020121 is about 31953.4054679623. The cubic root of 1021020121 is about 1006.9581784563.

Adding to 1021020121 its reverse (1210201201), we get a palindrome (2231221322).

The spelling of 1021020121 in words is "one billion, twenty-one million, twenty thousand, one hundred twenty-one".