16061221 has 4 divisors (see below), whose sum is σ = 17521344. Its totient is φ = 14601100.

The previous prime is 16061197. The next prime is 16061233. The reversal of 16061221 is 12216061.

16061221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16061221 - 2⁵ = 16061189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16061261) 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, 730045 + ... + 730066.

It is an arithmetic number, because the mean of its divisors is an integer number (4380336).

Almost surely, 2^16061221 is an apocalyptic number.

16061221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16061221 is a deficient number, since it is larger than the sum of its proper divisors (1460123).

16061221 is a wasteful number, since it uses less digits than its factorization.

16061221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460122.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16061221 is about 4007.6453186379. The cubic root of 16061221 is about 252.3051910459.

Adding to 16061221 its reverse (12216061), we get a palindrome (28277282).

The spelling of 16061221 in words is "sixteen million, sixty-one thousand, two hundred twenty-one".