1021513121 has 16 divisors (see below), whose sum is σ = 1047850944. Its totient is φ = 995626944.

The previous prime is 1021513027. The next prime is 1021513123. The reversal of 1021513121 is 1213151201.

1021513121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1021513121 - 2¹⁰ = 1021512097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021513121.

It is not an unprimeable number, because it can be changed into a prime (1021513123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3609446 + ... + 3609728.

It is an arithmetic number, because the mean of its divisors is an integer number (65490684).

Almost surely, 2^1021513121 is an apocalyptic number.

It is an amenable number.

1021513121 is a deficient number, since it is larger than the sum of its proper divisors (26337823).

1021513121 is a wasteful number, since it uses less digits than its factorization.

1021513121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1021513121 is about 31961.1188946820. The cubic root of 1021513121 is about 1007.1202224398.

Adding to 1021513121 its reverse (1213151201), we get a palindrome (2234664322).

The spelling of 1021513121 in words is "one billion, twenty-one million, five hundred thirteen thousand, one hundred twenty-one".