16221016061 has 2 divisors, whose sum is σ = 16221016062. Its totient is φ = 16221016060.

The previous prime is 16221016003. The next prime is 16221016069. The reversal of 16221016061 is 16061012261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15696331225 + 524684836 = 125285^2 + 22906^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221016061 - 2²⁶ = 16153907197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16221016061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221016069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110508030 + 8110508031.

It is an arithmetic number, because the mean of its divisors is an integer number (8110508031).

Almost surely, 2^16221016061 is an apocalyptic number.

It is an amenable number.

16221016061 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221016061 is an equidigital number, since it uses as much as digits as its factorization.

16221016061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 16221016061 in words is "sixteen billion, two hundred twenty-one million, sixteen thousand, sixty-one".