1650365021 has 2 divisors, whose sum is σ = 1650365022. Its totient is φ = 1650365020.

The previous prime is 1650364999. The next prime is 1650365029. The reversal of 1650365021 is 1205630561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1173816121 + 476548900 = 34261^2 + 21830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1650365021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1650365029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825182510 + 825182511.

It is an arithmetic number, because the mean of its divisors is an integer number (825182511).

Almost surely, 2^1650365021 is an apocalyptic number.

It is an amenable number.

1650365021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650365021 is an equidigital number, since it uses as much as digits as its factorization.

1650365021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1650365021 is about 40624.6848726239. The cubic root of 1650365021 is about 1181.7528819848.

Adding to 1650365021 its reverse (1205630561), we get a palindrome (2855995582).

The spelling of 1650365021 in words is "one billion, six hundred fifty million, three hundred sixty-five thousand, twenty-one".