1021340261 has 2 divisors, whose sum is σ = 1021340262. Its totient is φ = 1021340260.

The previous prime is 1021340213. The next prime is 1021340371. The reversal of 1021340261 is 1620431201.

1021340261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551968036 + 469372225 = 23494^2 + 21665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021340261 - 2⁶ = 1021340197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021340861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510670130 + 510670131.

It is an arithmetic number, because the mean of its divisors is an integer number (510670131).

Almost surely, 2^1021340261 is an apocalyptic number.

It is an amenable number.

1021340261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021340261 is an equidigital number, since it uses as much as digits as its factorization.

1021340261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1021340261 is about 31958.4145570458. The cubic root of 1021340261 is about 1007.0634110884.

Adding to 1021340261 its reverse (1620431201), we get a palindrome (2641771462).

The spelling of 1021340261 in words is "one billion, twenty-one million, three hundred forty thousand, two hundred sixty-one".