13021610221 has 2 divisors, whose sum is σ = 13021610222. Its totient is φ = 13021610220.

The previous prime is 13021610201. The next prime is 13021610249. The reversal of 13021610221 is 12201612031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8369688196 + 4651922025 = 91486^2 + 68205^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021610221 - 2¹³ = 13021602029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13021610201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510805110 + 6510805111.

It is an arithmetic number, because the mean of its divisors is an integer number (6510805111).

Almost surely, 2^13021610221 is an apocalyptic number.

It is an amenable number.

13021610221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021610221 is an equidigital number, since it uses as much as digits as its factorization.

13021610221 is an evil number, because the sum of its binary digits is even.

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

The spelling of 13021610221 in words is "thirteen billion, twenty-one million, six hundred ten thousand, two hundred twenty-one".