1213330021 has 2 divisors, whose sum is σ = 1213330022. Its totient is φ = 1213330020.

The previous prime is 1213330003. The next prime is 1213330039. The reversal of 1213330021 is 1200333121.

It is a balanced prime because it is at equal distance from previous prime (1213330003) and next prime (1213330039).

It can be written as a sum of positive squares in only one way, i.e., 966525921 + 246804100 = 31089^2 + 15710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213330021 - 2⁵ = 1213329989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213329977 and 1213330004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213330091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606665010 + 606665011.

It is an arithmetic number, because the mean of its divisors is an integer number (606665011).

Almost surely, 2^1213330021 is an apocalyptic number.

It is an amenable number.

1213330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213330021 is an equidigital number, since it uses as much as digits as its factorization.

1213330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1213330021 is about 34832.8870609371. The cubic root of 1213330021 is about 1066.5788834769.

Adding to 1213330021 its reverse (1200333121), we get a palindrome (2413663142).

The spelling of 1213330021 in words is "one billion, two hundred thirteen million, three hundred thirty thousand, twenty-one".