1021421207 has 2 divisors, whose sum is σ = 1021421208. Its totient is φ = 1021421206.

The previous prime is 1021421179. The next prime is 1021421213. The reversal of 1021421207 is 7021241201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021421207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021421507) 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 as a sum of consecutive naturals, namely, 510710603 + 510710604.

It is an arithmetic number, because the mean of its divisors is an integer number (510710604).

Almost surely, 2^1021421207 is an apocalyptic number.

1021421207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021421207 is an equidigital number, since it uses as much as digits as its factorization.

1021421207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 1021421207 is about 31959.6809589833. The cubic root of 1021421207 is about 1007.0900152165.

Adding to 1021421207 its reverse (7021241201), we get a palindrome (8042662408).

The spelling of 1021421207 in words is "one billion, twenty-one million, four hundred twenty-one thousand, two hundred seven".