1021342661 has 2 divisors, whose sum is σ = 1021342662. Its totient is φ = 1021342660.

The previous prime is 1021342649. The next prime is 1021342691. The reversal of 1021342661 is 1662431201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676312036 + 345030625 = 26006^2 + 18575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021342661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021342661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021342601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510671330 + 510671331.

It is an arithmetic number, because the mean of its divisors is an integer number (510671331).

Almost surely, 2^1021342661 is an apocalyptic number.

It is an amenable number.

1021342661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021342661 is an equidigital number, since it uses as much as digits as its factorization.

1021342661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1021342661 is about 31958.4521058201. The cubic root of 1021342661 is about 1007.0641999050.

Adding to 1021342661 its reverse (1662431201), we get a palindrome (2683773862).

The spelling of 1021342661 in words is "one billion, twenty-one million, three hundred forty-two thousand, six hundred sixty-one".