1020001321 has 16 divisors (see below), whose sum is σ = 1064750400. Its totient is φ = 976377600.

The previous prime is 1020001303. The next prime is 1020001337. The reversal of 1020001321 is 1231000201.

It is a cyclic number.

It is not a de Polignac number, because 1020001321 - 2⁵ = 1020001289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020001298 and 1020001307.

It is not an unprimeable number, because it can be changed into a prime (1020001421) 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, 506206 + ... + 508216.

It is an arithmetic number, because the mean of its divisors is an integer number (66546900).

Almost surely, 2^1020001321 is an apocalyptic number.

It is an amenable number.

1020001321 is a deficient number, since it is larger than the sum of its proper divisors (44749079).

1020001321 is a wasteful number, since it uses less digits than its factorization.

1020001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1020001321 is about 31937.4595263931. The cubic root of 1020001321 is about 1006.6231441183.

Adding to 1020001321 its reverse (1231000201), we get a palindrome (2251001522).

The spelling of 1020001321 in words is "one billion, twenty million, one thousand, three hundred twenty-one".