1021440263 has 2 divisors, whose sum is σ = 1021440264. Its totient is φ = 1021440262.

The previous prime is 1021440227. The next prime is 1021440271. The reversal of 1021440263 is 3620441201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021440263 - 2¹⁶ = 1021374727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021440283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510720131 + 510720132.

It is an arithmetic number, because the mean of its divisors is an integer number (510720132).

Almost surely, 2^1021440263 is an apocalyptic number.

1021440263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021440263 is an equidigital number, since it uses as much as digits as its factorization.

1021440263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1021440263 is about 31959.9790832222. The cubic root of 1021440263 is about 1007.0962780550.

Adding to 1021440263 its reverse (3620441201), we get a palindrome (4641881464).

The spelling of 1021440263 in words is "one billion, twenty-one million, four hundred forty thousand, two hundred sixty-three".