1201011321 has 4 divisors (see below), whose sum is σ = 1601348432. Its totient is φ = 800674212.

The previous prime is 1201011311. The next prime is 1201011349. The reversal of 1201011321 is 1231101021.

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.

It is not a de Polignac number, because 1201011321 - 2¹¹ = 1201009273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201011297 and 1201011306.

It is not an unprimeable number, because it can be changed into a prime (1201011311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200168551 + ... + 200168556.

It is an arithmetic number, because the mean of its divisors is an integer number (400337108).

Almost surely, 2^1201011321 is an apocalyptic number.

It is an amenable number.

1201011321 is a deficient number, since it is larger than the sum of its proper divisors (400337111).

1201011321 is an equidigital number, since it uses as much as digits as its factorization.

1201011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400337110.

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

The square root of 1201011321 is about 34655.6102384592. The cubic root of 1201011321 is about 1062.9570100614.

Adding to 1201011321 its reverse (1231101021), we get a palindrome (2432112342).

The spelling of 1201011321 in words is "one billion, two hundred one million, eleven thousand, three hundred twenty-one".