1211321013 has 24 divisors (see below), whose sum is σ = 1960475328. Its totient is φ = 662086656.

The previous prime is 1211320991. The next prime is 1211321017. The reversal of 1211321013 is 3101231121.

It is a happy number.

It is not a de Polignac number, because 1211321013 - 2⁸ = 1211320757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211320983 and 1211321001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211321017) 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, 175756 + ... + 182517.

It is an arithmetic number, because the mean of its divisors is an integer number (81686472).

Almost surely, 2^1211321013 is an apocalyptic number.

It is an amenable number.

1211321013 is a deficient number, since it is larger than the sum of its proper divisors (749154315).

1211321013 is a wasteful number, since it uses less digits than its factorization.

1211321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358313 (or 358306 counting only the distinct ones).

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

The square root of 1211321013 is about 34804.0373089100. The cubic root of 1211321013 is about 1065.9898848227.

Adding to 1211321013 its reverse (3101231121), we get a palindrome (4312552134).

The spelling of 1211321013 in words is "one billion, two hundred eleven million, three hundred twenty-one thousand, thirteen".