1021102661 has 2 divisors, whose sum is σ = 1021102662. Its totient is φ = 1021102660.

The previous prime is 1021102657. The next prime is 1021102681. The reversal of 1021102661 is 1662011201.

It is an a-pointer prime, because the next prime (1021102681) can be obtained adding 1021102661 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1018822561 + 2280100 = 31919^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021102661 - 2² = 1021102657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021102601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510551330 + 510551331.

It is an arithmetic number, because the mean of its divisors is an integer number (510551331).

Almost surely, 2^1021102661 is an apocalyptic number.

It is an amenable number.

1021102661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021102661 is an equidigital number, since it uses as much as digits as its factorization.

1021102661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1021102661 is about 31954.6970099859. The cubic root of 1021102661 is about 1006.9853121326.

Adding to 1021102661 its reverse (1662011201), we get a palindrome (2683113862).

The spelling of 1021102661 in words is "one billion, twenty-one million, one hundred two thousand, six hundred sixty-one".