1021225643 has 2 divisors, whose sum is σ = 1021225644. Its totient is φ = 1021225642.

The previous prime is 1021225607. The next prime is 1021225651. The reversal of 1021225643 is 3465221201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021225643 - 2¹⁰ = 1021224619 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1021225943) 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, 510612821 + 510612822.

It is an arithmetic number, because the mean of its divisors is an integer number (510612822).

Almost surely, 2^1021225643 is an apocalyptic number.

1021225643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021225643 is an equidigital number, since it uses as much as digits as its factorization.

1021225643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1021225643 is about 31956.6212700905. The cubic root of 1021225643 is about 1007.0257377434.

Adding to 1021225643 its reverse (3465221201), we get a palindrome (4486446844).

The spelling of 1021225643 in words is "one billion, twenty-one million, two hundred twenty-five thousand, six hundred forty-three".