1210321013 has 6 divisors (see below), whose sum is σ = 1330352982. Its totient is φ = 1100291720.

The previous prime is 1210320997. The next prime is 1210321037. The reversal of 1210321013 is 3101230121.

It can be written as a sum of positive squares in only one way, i.e., 967023409 + 243297604 = 31097^2 + 15598^2 .

It is not a de Polignac number, because 1210321013 - 2⁴ = 1210320997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210321213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5001206 + ... + 5001447.

It is an arithmetic number, because the mean of its divisors is an integer number (221725497).

Almost surely, 2^1210321013 is an apocalyptic number.

It is an amenable number.

1210321013 is a deficient number, since it is larger than the sum of its proper divisors (120031969).

1210321013 is a wasteful number, since it uses less digits than its factorization.

1210321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002675 (or 10002664 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1210321013 is about 34789.6681933013. The cubic root of 1210321013 is about 1065.6964631921.

Adding to 1210321013 its reverse (3101230121), we get a palindrome (4311551134).

It can be divided in two parts, 1210 and 321013, that added together give a palindrome (322223).

The spelling of 1210321013 in words is "one billion, two hundred ten million, three hundred twenty-one thousand, thirteen".