1021603213 has 12 divisors (see below), whose sum is σ = 1104794460. Its totient is φ = 943475456.

The previous prime is 1021603091. The next prime is 1021603223. The reversal of 1021603213 is 3123061201.

It can be written as a sum of positive squares in 2 ways, for example, as 461476324 + 560126889 = 21482^2 + 23667^2 .

It is not a de Polignac number, because 1021603213 - 2¹⁷ = 1021472141 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 (1021603223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17956 + ... + 48637.

It is an arithmetic number, because the mean of its divisors is an integer number (92066205).

Almost surely, 2^1021603213 is an apocalyptic number.

It is an amenable number.

1021603213 is a deficient number, since it is larger than the sum of its proper divisors (83191247).

1021603213 is an equidigital number, since it uses as much as digits as its factorization.

1021603213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66668 (or 66645 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1021603213 is about 31962.5282635776. The cubic root of 1021603213 is about 1007.1498291105.

Adding to 1021603213 its reverse (3123061201), we get a palindrome (4144664414).

The spelling of 1021603213 in words is "one billion, twenty-one million, six hundred three thousand, two hundred thirteen".