1212410021 has 2 divisors, whose sum is σ = 1212410022. Its totient is φ = 1212410020.

The previous prime is 1212409999. The next prime is 1212410039. The reversal of 1212410021 is 1200142121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1011876100 + 200533921 = 31810^2 + 14161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212410021 - 2¹⁸ = 1212147877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212409978 and 1212410005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212410621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606205010 + 606205011.

It is an arithmetic number, because the mean of its divisors is an integer number (606205011).

Almost surely, 2^1212410021 is an apocalyptic number.

It is an amenable number.

1212410021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212410021 is an equidigital number, since it uses as much as digits as its factorization.

1212410021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1212410021 is about 34819.6786458462. The cubic root of 1212410021 is about 1066.3092396949.

Adding to 1212410021 its reverse (1200142121), we get a palindrome (2412552142).

It can be divided in two parts, 121 and 2410021, that added together give a palindrome (2410142).

The spelling of 1212410021 in words is "one billion, two hundred twelve million, four hundred ten thousand, twenty-one".