16290837221 has 4 divisors (see below), whose sum is σ = 16292042700. Its totient is φ = 16289631744.

The previous prime is 16290837217. The next prime is 16290837239. The reversal of 16290837221 is 12273809261.

16290837221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7676212996 + 8614624225 = 87614^2 + 92815^2 .

It is a cyclic number.

It is not a de Polignac number, because 16290837221 - 2² = 16290837217 is a prime.

It is a super-2 number, since 2×16290837221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16290837271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582236 + ... + 609573.

It is an arithmetic number, because the mean of its divisors is an integer number (4073010675).

Almost surely, 2^16290837221 is an apocalyptic number.

It is an amenable number.

16290837221 is a deficient number, since it is larger than the sum of its proper divisors (1205479).

16290837221 is a wasteful number, since it uses less digits than its factorization.

16290837221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205478.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 16290837221 in words is "sixteen billion, two hundred ninety million, eight hundred thirty-seven thousand, two hundred twenty-one".