16155410221 has 2 divisors, whose sum is σ = 16155410222. Its totient is φ = 16155410220.

The previous prime is 16155410213. The next prime is 16155410239. The reversal of 16155410221 is 12201455161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16130270025 + 25140196 = 127005^2 + 5014^2 .

It is a cyclic number.

It is not a de Polignac number, because 16155410221 - 2³ = 16155410213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16155410221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16155410261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8077705110 + 8077705111.

It is an arithmetic number, because the mean of its divisors is an integer number (8077705111).

Almost surely, 2^16155410221 is an apocalyptic number.

It is an amenable number.

16155410221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16155410221 is an equidigital number, since it uses as much as digits as its factorization.

16155410221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 16155410221 its reverse (12201455161), we get a palindrome (28356865382).

The spelling of 16155410221 in words is "sixteen billion, one hundred fifty-five million, four hundred ten thousand, two hundred twenty-one".