2099630821 has 2 divisors, whose sum is σ = 2099630822. Its totient is φ = 2099630820.

The previous prime is 2099630737. The next prime is 2099630861. The reversal of 2099630821 is 1280369902.

It is a happy number.

It is an a-pointer prime, because the next prime (2099630861) can be obtained adding 2099630821 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2064702721 + 34928100 = 45439^2 + 5910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2099630821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099630861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049815410 + 1049815411.

It is an arithmetic number, because the mean of its divisors is an integer number (1049815411).

Almost surely, 2^2099630821 is an apocalyptic number.

It is an amenable number.

2099630821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099630821 is an equidigital number, since it uses as much as digits as its factorization.

2099630821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 2099630821 is about 45821.7286993845. The cubic root of 2099630821 is about 1280.5041188538.

The spelling of 2099630821 in words is "two billion, ninety-nine million, six hundred thirty thousand, eight hundred twenty-one".