1021003213 has 4 divisors (see below), whose sum is σ = 1021663900. Its totient is φ = 1020342528.

The previous prime is 1021003157. The next prime is 1021003229. The reversal of 1021003213 is 3123001201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 643789129 + 377214084 = 25373^2 + 19422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021003213 - 2¹⁷ = 1020872141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021003193 and 1021003202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021003273) 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, 328020 + ... + 331117.

It is an arithmetic number, because the mean of its divisors is an integer number (255415975).

Almost surely, 2^1021003213 is an apocalyptic number.

It is an amenable number.

1021003213 is a deficient number, since it is larger than the sum of its proper divisors (660687).

1021003213 is an equidigital number, since it uses as much as digits as its factorization.

1021003213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660686.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1021003213 is about 31953.1408941281. The cubic root of 1021003213 is about 1006.9526200471.

Adding to 1021003213 its reverse (3123001201), we get a palindrome (4144004414).

The spelling of 1021003213 in words is "one billion, twenty-one million, three thousand, two hundred thirteen".