1021210213 has 8 divisors (see below), whose sum is σ = 1096094808. Its totient is φ = 947971584.

The previous prime is 1021210133. The next prime is 1021210231. The reversal of 1021210213 is 3120121201.

It can be written as a sum of positive squares in 4 ways, for example, as 220433409 + 800776804 = 14847^2 + 28298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021210213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021210193 and 1021210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210273) 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 7 ways as a sum of consecutive naturals, for example, 410206 + ... + 412687.

It is an arithmetic number, because the mean of its divisors is an integer number (137011851).

Almost surely, 2^1021210213 is an apocalyptic number.

It is an amenable number.

1021210213 is a deficient number, since it is larger than the sum of its proper divisors (74884595).

1021210213 is an equidigital number, since it uses as much as digits as its factorization.

1021210213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822983.

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

The square root of 1021210213 is about 31956.3798481618. The cubic root of 1021210213 is about 1007.0206659013.

Adding to 1021210213 its reverse (3120121201), we get a palindrome (4141331414).

The spelling of 1021210213 in words is "one billion, twenty-one million, two hundred ten thousand, two hundred thirteen".