1213011321 has 16 divisors (see below), whose sum is σ = 1625086848. Its totient is φ = 804816000.

The previous prime is 1213011311. The next prime is 1213011323. The reversal of 1213011321 is 1231103121.

It is a happy number.

It is not a de Polignac number, because 1213011321 - 2⁶ = 1213011257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213011321.

It is not an unprimeable number, because it can be changed into a prime (1213011323) 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, 672621 + ... + 674421.

It is an arithmetic number, because the mean of its divisors is an integer number (101567928).

Almost surely, 2^1213011321 is an apocalyptic number.

It is an amenable number.

1213011321 is a deficient number, since it is larger than the sum of its proper divisors (412075527).

1213011321 is a wasteful number, since it uses less digits than its factorization.

1213011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1213011321 is about 34828.3120607359. The cubic root of 1213011321 is about 1066.4854907889.

Adding to 1213011321 its reverse (1231103121), we get a palindrome (2444114442).

The spelling of 1213011321 in words is "one billion, two hundred thirteen million, eleven thousand, three hundred twenty-one".