2104699921 has 2 divisors, whose sum is σ = 2104699922. Its totient is φ = 2104699920.

The previous prime is 2104699879. The next prime is 2104700023. The reversal of 2104699921 is 1299964012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1149210000 + 955489921 = 33900^2 + 30911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104699921 - 2²¹ = 2102602769 is a prime.

It is not a weakly prime, because it can be changed into another prime (2104699021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052349960 + 1052349961.

It is an arithmetic number, because the mean of its divisors is an integer number (1052349961).

Almost surely, 2^2104699921 is an apocalyptic number.

It is an amenable number.

2104699921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2104699921 is an equidigital number, since it uses as much as digits as its factorization.

2104699921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 2104699921 is about 45877.0086317755. The cubic root of 2104699921 is about 1281.5337898252.

The spelling of 2104699921 in words is "two billion, one hundred four million, six hundred ninety-nine thousand, nine hundred twenty-one".