1021020961 has 2 divisors, whose sum is σ = 1021020962. Its totient is φ = 1021020960.

The previous prime is 1021020953. The next prime is 1021021007. The reversal of 1021020961 is 1690201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982195600 + 38825361 = 31340^2 + 6231^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020961 - 2³ = 1021020953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021020911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510480 + 510510481.

It is an arithmetic number, because the mean of its divisors is an integer number (510510481).

Almost surely, 2^1021020961 is an apocalyptic number.

It is an amenable number.

1021020961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020961 is an equidigital number, since it uses as much as digits as its factorization.

1021020961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1021020961 is about 31953.4186120985. The cubic root of 1021020961 is about 1006.9584545999.

The spelling of 1021020961 in words is "one billion, twenty-one million, twenty thousand, nine hundred sixty-one".