1000120321 has 4 divisors (see below), whose sum is σ = 1000886832. Its totient is φ = 999353812.

The previous prime is 1000120313. The next prime is 1000120327. The reversal of 1000120321 is 1230210001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1230210001 = 1601 ⋅768401.

It is a cyclic number.

It is not a de Polignac number, because 1000120321 - 2³ = 1000120313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000120298 and 1000120307.

It is not an unprimeable number, because it can be changed into a prime (1000120327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381295 + ... + 383908.

It is an arithmetic number, because the mean of its divisors is an integer number (250221708).

Almost surely, 2^1000120321 is an apocalyptic number.

It is an amenable number.

1000120321 is a deficient number, since it is larger than the sum of its proper divisors (766511).

1000120321 is an equidigital number, since it uses as much as digits as its factorization.

1000120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766510.

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

The square root of 1000120321 is about 31624.6789865130. The cubic root of 1000120321 is about 1000.0401053915.

Adding to 1000120321 its reverse (1230210001), we get a palindrome (2230330322).

The spelling of 1000120321 in words is "one billion, one hundred twenty thousand, three hundred twenty-one".