1020321121 has 8 divisors (see below), whose sum is σ = 1045787400. Its totient is φ = 994882560.

The previous prime is 1020321053. The next prime is 1020321149. The reversal of 1020321121 is 1211230201.

It can be written as a sum of positive squares in 4 ways, for example, as 105863521 + 914457600 = 10289^2 + 30240^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1020321121 - 2⁷ = 1020320993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020321151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81445 + ... + 93133.

It is an arithmetic number, because the mean of its divisors is an integer number (130723425).

Almost surely, 2^1020321121 is an apocalyptic number.

It is an amenable number.

1020321121 is a deficient number, since it is larger than the sum of its proper divisors (25466279).

1020321121 is a wasteful number, since it uses less digits than its factorization.

1020321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13859.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1020321121 is about 31942.4657939865. The cubic root of 1020321121 is about 1006.7283349768.

Adding to 1020321121 its reverse (1211230201), we get a palindrome (2231551322).

The spelling of 1020321121 in words is "one billion, twenty million, three hundred twenty-one thousand, one hundred twenty-one".