16846434026221 has 2 divisors, whose sum is σ = 16846434026222. Its totient is φ = 16846434026220.

The previous prime is 16846434026183. The next prime is 16846434026239. The reversal of 16846434026221 is 12262043464861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14786032158121 + 2060401868100 = 3845261^2 + 1435410^2 .

It is a cyclic number.

It is not a de Polignac number, because 16846434026221 - 2²¹ = 16846431929069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16846434026251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8423217013110 + 8423217013111.

It is an arithmetic number, because the mean of its divisors is an integer number (8423217013111).

Almost surely, 2^{16846434026221} is an apocalyptic number.

It is an amenable number.

16846434026221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16846434026221 is an equidigital number, since it uses as much as digits as its factorization.

16846434026221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 49.

The spelling of 16846434026221 in words is "sixteen trillion, eight hundred forty-six billion, four hundred thirty-four million, twenty-six thousand, two hundred twenty-one".