1021312213 has 4 divisors (see below), whose sum is σ = 1081389420. Its totient is φ = 961235008.

The previous prime is 1021312177. The next prime is 1021312219. The reversal of 1021312213 is 3122131201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3122131201 = 7 ⋅446018743.

It can be written as a sum of positive squares in 2 ways, for example, as 856908529 + 164403684 = 29273^2 + 12822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021312213 - 2⁹ = 1021311701 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 (1021312219) 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, 30038578 + ... + 30038611.

It is an arithmetic number, because the mean of its divisors is an integer number (270347355).

Almost surely, 2^1021312213 is an apocalyptic number.

It is an amenable number.

1021312213 is a deficient number, since it is larger than the sum of its proper divisors (60077207).

1021312213 is an equidigital number, since it uses as much as digits as its factorization.

1021312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60077206.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1021312213 is about 31957.9757337664. The cubic root of 1021312213 is about 1007.0541923608.

Adding to 1021312213 its reverse (3122131201), we get a palindrome (4143443414).

The spelling of 1021312213 in words is "one billion, twenty-one million, three hundred twelve thousand, two hundred thirteen".