1020135321 has 24 divisors (see below), whose sum is σ = 1539422976. Its totient is φ = 650207520.

The previous prime is 1020135301. The next prime is 1020135331. The reversal of 1020135321 is 1235310201.

It is not a de Polignac number, because 1020135321 - 2²⁶ = 953026457 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1020135294 and 1020135303.

It is not an unprimeable number, because it can be changed into a prime (1020135301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1131 + ... + 45183.

It is an arithmetic number, because the mean of its divisors is an integer number (64142624).

Almost surely, 2^1020135321 is an apocalyptic number.

It is an amenable number.

1020135321 is a deficient number, since it is larger than the sum of its proper divisors (519287655).

1020135321 is a wasteful number, since it uses less digits than its factorization.

1020135321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44173 (or 44170 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1020135321 is about 31939.5573075145. The cubic root of 1020135321 is about 1006.6672230138.

Adding to 1020135321 its reverse (1235310201), we get a palindrome (2255445522).

The spelling of 1020135321 in words is "one billion, twenty million, one hundred thirty-five thousand, three hundred twenty-one".