1301212021 has 2 divisors, whose sum is σ = 1301212022. Its totient is φ = 1301212020.

The previous prime is 1301212001. The next prime is 1301212027. The reversal of 1301212021 is 1202121031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1298809521 + 2402500 = 36039^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301212021 - 2¹⁹ = 1300687733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1301211992 and 1301212010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301212027) 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 as a sum of consecutive naturals, namely, 650606010 + 650606011.

It is an arithmetic number, because the mean of its divisors is an integer number (650606011).

Almost surely, 2^1301212021 is an apocalyptic number.

It is an amenable number.

1301212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301212021 is an equidigital number, since it uses as much as digits as its factorization.

1301212021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1301212021 is about 36072.3165460717. The cubic root of 1301212021 is about 1091.7319549115.

Adding to 1301212021 its reverse (1202121031), we get a palindrome (2503333052).

The spelling of 1301212021 in words is "one billion, three hundred one million, two hundred twelve thousand, twenty-one".