16006002221 has 32 divisors (see below), whose sum is σ = 17942031360. Its totient is φ = 14157001600.

The previous prime is 16006002203. The next prime is 16006002239. The reversal of 16006002221 is 12220060061.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16006002203) and next prime (16006002239).

It is a cyclic number.

It is not a de Polignac number, because 16006002221 - 2⁶ = 16006002157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16006002193 and 16006002202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16006002251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24287990 + ... + 24288648.

It is an arithmetic number, because the mean of its divisors is an integer number (560688480).

Almost surely, 2^16006002221 is an apocalyptic number.

16006002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16006002221 is a deficient number, since it is larger than the sum of its proper divisors (1936029139).

16006002221 is a wasteful number, since it uses less digits than its factorization.

16006002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 16006002221 its reverse (12220060061), we get a palindrome (28226062282).

The spelling of 16006002221 in words is "sixteen billion, six million, two thousand, two hundred twenty-one".