1699244221 has 4 divisors (see below), whose sum is σ = 1740689244. Its totient is φ = 1657799200.

The previous prime is 1699244177. The next prime is 1699244249. The reversal of 1699244221 is 1224429961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224429961 = 10937 ⋅111953.

It can be written as a sum of positive squares in 2 ways, for example, as 420824196 + 1278420025 = 20514^2 + 35755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1699244221 - 2⁷ = 1699244093 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1699224221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20722450 + ... + 20722531.

It is an arithmetic number, because the mean of its divisors is an integer number (435172311).

Almost surely, 2^1699244221 is an apocalyptic number.

It is an amenable number.

1699244221 is a deficient number, since it is larger than the sum of its proper divisors (41445023).

1699244221 is an equidigital number, since it uses as much as digits as its factorization.

1699244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41445022.

The product of its digits is 62208, while the sum is 40.

The square root of 1699244221 is about 41221.8900706894. The cubic root of 1699244221 is about 1193.3063010966.

The spelling of 1699244221 in words is "one billion, six hundred ninety-nine million, two hundred forty-four thousand, two hundred twenty-one".