1021201213 has 4 divisors (see below), whose sum is σ = 1021368700. Its totient is φ = 1021033728.

The previous prime is 1021201201. The next prime is 1021201217. The reversal of 1021201213 is 3121021201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3121021201 = 6871 ⋅454231.

It can be written as a sum of positive squares in 2 ways, for example, as 189282564 + 831918649 = 13758^2 + 28843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021201213 - 2⁹ = 1021200701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021201193 and 1021201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021201217) 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, 74238 + ... + 86911.

It is an arithmetic number, because the mean of its divisors is an integer number (255342175).

Almost surely, 2^1021201213 is an apocalyptic number.

It is an amenable number.

1021201213 is a deficient number, since it is larger than the sum of its proper divisors (167487).

1021201213 is an equidigital number, since it uses as much as digits as its factorization.

1021201213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167486.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021201213 is about 31956.2390308997. The cubic root of 1021201213 is about 1007.0177075772.

Adding to 1021201213 its reverse (3121021201), we get a palindrome (4142222414).

The spelling of 1021201213 in words is "one billion, twenty-one million, two hundred one thousand, two hundred thirteen".